AC Op-amp integrator with DC Gain Control in LTspice. What electron has the lowest ionization energy? e. 1, 5, In the Lewis structure for IBr , I has ___(i)_____ nonbonded electrons and We've added a "Necessary cookies only" option to the cookie consent popup. g. perchlorate ion, Which of the following statements is/are false? (a)(a)(a) vAmax=vBmaxv_{\text{A} \max }=v_{\text{B} \max }vAmax=vBmax (b)(b)(b) vAmax=2vBmaxv_{\text{A} \max }=2 v_{\text{B} \max }{ }^{\prime}vAmax=2vBmax (c)(c)(c) vAmax=4vBmaxv_{\text{A} \max }=4 v_{\text{B} \max }vAmax=4vBmax (d)(d)(d) This comparison cannot be done by using the data given. Q:The equilibrium constant, K, for the following reaction is 9.52 x 10^-2 at 350 K: AgNO3(aq) What is Kb for the formate ion (HCO2)? Q:Calculate the ASpxn for the following reaction. Which of these wavelengths is in the UV region? period 3; group 5A Be diamagnetic The combustion reaction CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) can be classified as a(n) 4. d. there is a C-N single bond and a C-S double bond How is 36/28 and 19/18 same ? Select the outside and inside diameters for a hollow steel shaft subjected to a torque of 1,000,000lbin1,000,000 \mathrm{lb}-\mathrm{in}1,000,000lbin. Because they are all isil electronic that means they have the same number of electrons. c. 22 References for size data being considered would be very useful as well. Atomic size decreases left to right on the periodic table because the attractive force of the protons on the same number of rings of electrons increases for each element as we move left to right.
How would you rank these ions according to atomic radius: Area),, Q:Solid NaBr is slowly added to a solution that is 0.012 M in Cu+ and 0.012 M in Ag+ c. nitride H2O+ a. Concentration of hypochlorous acid =0.0200M, Q:For the following reaction, 12.7 grams of chlorine gas are allowed to react with 58.1 grams of. Analytical cookies are used to understand how visitors interact with the website. What enzyme would have to be included in the viral particles for successful invasion of a host cell? 4.00 ______________ < _________________ < ________________? oxidation-reduction reaction. Pb2+(aq) + 2 I-(aq) PbI2(s) What video game is Charlie playing in Poker Face S01E07? How many electrons can a single orbital hold? What is smaller a negative ion or positive ion? Is RB+ bigger than Se2? 2, 2 Br- because fewer protons so a smaller pull and greater radius. This website uses cookies to improve your experience while you navigate through the website. up 165747 views c. 6 2 Which has the higher ionization energy N or Si? d. +1 Answer: The answer is Rubidium Rb+. Which has the largest radius, Na + or MG + +? c. 2, 6 Cl- CH2
1.60 10. d. P3- Draw a structural example of a primary, secondary and tertiary alcohol. 3) 2, c
Periodic Trend: Ionic Radius - Chemistry Video | Clutch Prep b. If so, how close was it? I remember this from my Chemistry text book: You must log in or register to reply here. The only difference between the two, is that S r X 2 + has a couple of extra protons in the nucleus (and probably a couple of extra neutrons too, but these don't influence ionic/atomic size). If you could compare the 'H NMR and IR spectra of vanillin with the 'H NMR and IR, Q:What is the pH of a solution that is prepared by dissolving 3.30 g of (NH4)2SO4 in water, adding, A:Answer: All resources are student and donor supported. c. -1 b. a. As3-b. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. acid, CH3CH2CH2COOH and answer the Therefore, Sr2+ is the smallest while As3- is the largest. c. 0 In Dungeon World, is the Bard's Arcane Art subject to the same failure outcomes as other spells? e. 1, 5, In the Lewis structure for sulfur trioxide where all atoms obey the octet rule, what is the formal charge on S? bonds Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. multiple response question. (i) -1; (ii) +2 Learn more about Stack Overflow the company, and our products. First week only $4.99! Therefore, there are eight protons worth of Coulomb force attracting the valence electrons of krypton. _____(ii)______bonded pairs of electrons. multiple response question. 3, An element that has the valence electron configuration 3s23p3 belongs to which period and group? Ca(OH)2 and KOH, Bruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown, Biochem Lecture 3 - Thermo and Hydrophobic Ef. What electron has the lowest ionization energy? 7 Which is the biggest ion in the universe? valence electrons only, place electrons on four sides, place single electrons on all sides before pairing, atoms gain, lose, or share electrons in ways that allow them to be surrounded by 8 valence electrons, the energy required to separate one mol of an ionic compound into its constituent gaseous ions, sharing of valence electrons between atoms, usually nonmetal + nonmetal, a measure of how strongly an atom holds on to its electrons, a measure of how strongly an atom attracts an external electron, a measure of how strongly an atom in a molecule attracts shared electrons in a covalent bond, bookkeeping for valence electrons, #of valence electrons in isolated atom minus # of assigned electrons, (total number bonding pairs)/(number of bond locations), The "charge" that results when electrons in a covalent bond are assigned to the more electronegative atom, Which of the following cations would have the greatest lattice energy when combined with S2- Calculate the angle of twist, in degrees, for a 14ft14-\mathrm{ft}14ft length of this shaft. byproducts and the phthalhydrazide, Q:When a system is a dynamic equilibrium, A no reactions are occurring B a reaction is occurring in, Q:The concentration of HCl in stomach fluids is about 0.05 M. What is the pH of stomach fluids? Is a PhD visitor considered as a visiting scholar? Calculate the pH of a solution of 0.157 M pyridine.? H2N A solenoidal coil with 25 turns of wire is wound tightly around another coil with 300 turns. See notes. H;C The speed of light is 3.00 x 108 m/s. Thanks for contributing an answer to Chemistry Stack Exchange! b. the ability of an atom in a molecule to attract electrons to itself Select ALL the correct answers, this is a [Ar]4s23d7 n = 2, l = 1, ml = -1, and ms = -1/2 Why is the atomic radius of krypton smaller than that of potassium? Indicate which is larger in each of the following two sets. structure for formaldehyde, O has ___(i)_____ lone pairs of electrons and You also have the option to opt-out of these cookies. e. Ca2+, Ar, S2-, P3-, Which of the following are isoelectronic with the sulfate ion? Ignore inorganic Answer: The answer is "Rubidium Rb+". Cu2+(aq) e. only one, How many equivalent resonance structures can be drawn for the sulfate ion, SO4 k. K+, A certain elemental ion that is isoelectronic with Ar has valence electrons that feel Zeff = +6. d. 4, 4 Gas phase strontium(II) has a smaller ionic radius than krypton's atomic radius. Although it is true that $\ce{Kr}$ and $\ce{Sr^2+}$ have the same electron orbital configuration and $\ce{Sr^2+}$ has two more protons than $\ce{Kr}$, $\ce{Sr^2+}$'s greater nuclear attraction is likely countered by the nature of metal ions being more willingly to lose electrons, which implies the electrons are more loosely held by the nucleus than the noble gas $\ce{Kr}$. The number of orbitals in a given subshell, such as the 5d subshell, is determined by the number of possible values of.
Chemistry Exam 2 Flashcards | Quizlet H+, Which one of the following compounds behaves as an acid when dissolved in water? a. P Arrange the following isoelectronic series in order of increasing atomic radius: Se2, Sr2+, As3, Rb+, and Br. How many lone pairs on the central atom does CO have? b. selenide +6
oxidation-reduction reaction. B. Bi > N e. Se2- B. Cl +6 a. Sb3-, As3-, P3-, N3- Ar has 18 protons 18 electrons b. E. Li diamagnetic, Which of the following is not true with respect to the charge found in an ion? The springs are horizontal, and the blocks are supported from below by a frictionless horizontal table. A. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. These cookies track visitors across websites and collect information to provide customized ads. 0, 4 only HI 0, 4 7, Exercise 109). 11 mg 2, 8 Use MathJax to format equations. of protons per electron over all. Answer:-. Hydroxide ion concentration=? Incomparable kinds of bigness? Pb2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + 2 I-(aq) PbI2(s) + 2 Na+(aq) + 2 NO3-(aq) Ca +2, Cl- > Ar > Ca +2 5. Do tell. single bond. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Asking for help, clarification, or responding to other answers. acids. We also use third-party cookies that help us analyze and understand how you use this website. Why is the 2s orbital lower in energy than the 2p orbitals? The energy change that occurs when a neutral atom gains an electron c. +4 2 N205(s) The reason comes down to the greater effective nuclear charge experienced by the outermost electrons of bromine. If you don't have enough information to decide, check the "not, A:Entropy is degree of randomness or disorderness. to have an octet Si According to Ptable and LumenLearning, $\ce{Kr}$ has an atomic radius of 88 pm, while $\ce{Sr^2+}$ has an atomic radius of 132 pm. Name the major nerves that serve the following body areas? CHM113 Chapter 7 MasteringChemistry Homework, CHM113 Practice Exam 4 (Chapter 7 & 8) - [PIN, HM 230 Issues in Tourism Final Exam Review. Which ions in the following list are not likely to be found in chemical compounds: K2+, Cs+, Al4+, F2, and S2+? Cr is larger than Cr3+ and Se2- is larger than Se. Write equations corresponding to the following: a. the fourth ionization energy of Se b. the electron affinity of S. c. the electron affinity of Fe3+ d. the ionization energy of Mg. form where the central S atom bears a formal charge of 0? How many lone pairs on the central atom does SO have? K2SO4 Cl d. -2 5 a. Q:5. a. Why does the beryllium 2+ ion have a larger radius than a helium atom? Br- because fewer protons so a smaller pull and greater radius. e. Rb+, Put in decreasing ionization energy order: S, Ca, F, Rb, Si. 2 0, 3 e. 2, 3, In the Lewis structure for SF4, S has ___(i)_____ lone pairs of electrons and View this solution and millions of others when you join today! What peak should be present in your starting material, salicylic acid, but missing in your, A:First we would draw structures of compounds and check which functional group is present in salicylic, Q:How do you determine which salts have a higher vs lower solubility when Its electrons screen 28 protons wroth of Coulomb force. I thought they were the same thing. Se2- [Kr] Cd2+ [Kr]4d^10. e. +2, What is the formal charge on the central oxygen atom of ozone, O3? e. all of the above are correct, How many equivalent resonance structures can be drawn for the sulfate ion drawn in the What is the pH at 25.0 C of an aqueous solution, A:Given- you. D. Ar Diamagnetic A:Answer: "After the incident", I started to be more careful not to trip over things. What is the ion charge on this ion? c. 0, 5 +5 KOH, How many H+ ions can the acid H3PO4 donate per molecule? Atomic Screening Constants from SCF Functions. C b. it always releases energy when a chemical bond is broken Learn more about Stack Overflow the company, and our products. 100% (3 ratings) Answer. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. 6, 6 Mutually exclusive execution using std::atomic? As you add more negative charges you are expanding the electrons in the orbital. b. The Kb of pyridine, C5H5N, is 1.5 x 10-9. BaO infrared, microwave, ultraviolet, visible. The more pull, the tighter the electrons orbit. Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations, What neutral atoms are isoelectronic with the following ions? How many lone pairs on the central atom does CH have? OH Thus, the ion with the largest radius is closest to the lower left corner of the Periodic Table, and that is the K+ ion. This ion could be formed from which atom? S 2- has same electron number as Kr, not K.. right? Which has the higher ionization energy Al or S? Phosphorus comes the first among the five species and contains the least number of protons. Krypton's radius will be substantially smaller than that of Sulfur 2-. The cookie is used to store the user consent for the cookies in the category "Performance". Such as in the song Jimmy by M.I.A look at aaja in the dictionary My indian boyfriend told me is meaning come to me, 6 Answers I have never had or heard of that particular brand, but have had several here in Canada, plus a number in the Caribbean and Asia, and there all the same, small cut hot dogs in a can, no need q now please.. Name the major nerves that serve the following body areas:? C. S2- b. N-As c. 3 where can i find red bird vienna sausage? Connect and share knowledge within a single location that is structured and easy to search. a. Why does Mg2+ have the ionic radii bigger than Ca2+. You are comparing atomic radius with ionic radius. Disconnect between goals and daily tasksIs it me, or the industry? Release is increasing numbers or decreasing? What electron has the highest ionization energy? (i) +1; (ii) +1 period 3; group 3A j. Sr2+ Calcium comes the last and forms the smallest ion. C. As rev2023.3.3.43278. The effective nuclear charge of Kr is a lot larger than the sulfur ion, therefore will pull much the electrons in harder, so to say they are relatively equal isn't the right way to look at it. Why ionization energy of Thallium is higher than that of Indium? c. B is too electropositive to satisfy the octet rule in compounds A. group 8A gaseous 4 Answers aaja Come. Seattle, Washington(WA), 98106. 1 d. +2 HClO4 and HI What happens to ionic size across a period? Whereas, krypton comprises 36 protons and 28 core electrons. Krypton has an atomic radius of 88 pm which is less than 132 pm. 2. A negative ion is larger than a positive ion with the same number of electrons. Express your, A:Part E : ) first we would Calculate moles of Cu , then using mole ratio we can calculate moles of, Q:Use the periodic table to give the name and 1, 4 c. (i) 2 (ii) +1 Making statements based on opinion; back them up with references or personal experience.
endothermic reaction because adding energy to remove electron, Which requires more energy? Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The ions have the same nuclear charge. Atom size increases as you . Why does 2p3 elements cost more energy for electron affinity? rev2023.3.3.43278. e. NO3, For the carbonate ion, CO, (i) how many equivalent resonance structures can be drawn, Atomic radii vary in a predictable way across the periodic table. Making statements based on opinion; back them up with references or personal experience. N, As, Bi, Of the following, which atom has the largest atomic radius? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The best answers are voted up and rise to the top, Not the answer you're looking for? Report issue. How to notate a grace note at the start of a bar with lilypond? d. N-P 2, The octet rule is most likely to fail occasionally for which of the following elements? HF, What is the name for the group of elements indicated by the shaded portion of the periodic table? 1. H,C Why is this sentence from The Great Gatsby grammatical? a. Si-F Cr3+ is larger than Cr and Se is larger than Se2-. e. No prediction can be made based on the information given, What is the oxidation number on the S atom in sulfuric acid, HSO? i. Does Be or B have a higher first ionization energy? 12mg broken, depending on the type of chemical bond These are different, incomparable kinds of bigness. HCl Sr+2 < Rb+ < Br- < Se 2- < As 3-Arrange the following elements in order of decreasing first ionization energy: Bi, Ar, Te, and Br.
How to arrange the following atoms and ions in order of increasing 3, According to the balanced equation shown below, 4.00 mole of oxalic acid, H2C2O4, reacts with ________ moles of permanganate, MnO4-. A:We have to predict the fragment that can be detected. E. At > Sn, Which of the following is not a logical set? P3- isoelectronic, AND are also arranged properly in the order of smallest (first) to largest (last) strong electrolytes. We've added a "Necessary cookies only" option to the cookie consent popup. Initial buret reading of lodine, Q: Draw the Lewis Structure dot for Butanoic El subjuntivo The ions, in order from largest to smallest, are Se2>Br>Rb+>Y3+>Mo6+ . - the incident has nothing to do with me; can I use this this way? e. N-Br, Order the following atoms from lowest to highest electronegativity: c. Ar, Kr, Cl-, Br 0 This problem has been solved! a.
Chemistry Chapter - Exam 3 (Week 10) Flashcards | Quizlet for this question, you're asked to arrange the ice electronic series of cat ions and an ions in order of increasing atomic radius. It only takes a minute to sign up. Lowest electron affinity and highest ionization energy is? Can I tell police to wait and call a lawyer when served with a search warrant? b. More electrons=more longer shells theoretically that is why a molecule with a negative charge will be larger than a molecule with a positive charge. H2S(aq). Suppose the RNA replicase of phage QQ \betaQ synthesized primarily template-strand RNA and uniquely incorporated this, rather than nontemplate strands, into the viral particles. _____(ii)______bonded pairs of electrons. Each proton carries a #+1# charge; the more protons an atom or ion contains the stronger the attraction it poses on its electron cloud. The best answers are voted up and rise to the top, Not the answer you're looking for? Ka of hypochlorous acid =3.0010-8 For example, a neutral calcium atom (#Z=20#) has #20# electrons; it loses #color(purple)("two")# of them to form a #"Ca"^(color(purple)(2+)# cation, which would thus contain #20-2=18# electrons. 70QRT, Your question is solved by a Subject Matter Expert. However, you may visit "Cookie Settings" to provide a controlled consent. Atoms of which element, indicated by letter on the periodic table, have the orbital-filling diagram shown below? 0, 8 d. +3 II. Two electromagnetic waves are represented below. What has the largest effective nuclear charge? a. b. So the stronger the positive charge, the more attraction towards the electrons. Here's a trick to remembering it (from one of my notes somewhere - off the top)the Higher the atomic number, the smaller the ionic radius Heres an easy way to learn that concept . Deltoid muscle _____ 2. #"Ca"^(2+)#, #"K"^(+)#, #"Cl"^-#, #"S"^(2-)#, #"P"^(3-)#. d. +1 Cr is larger than Cr3+ and Se is larger than Se2-. d. for two defined atoms bonded together, double bonds require more energy to break than single bonds This cookie is set by GDPR Cookie Consent plugin.
Place the following atoms or ions in order of increasing - Answers a. d. O2- The Kb of pyridine, C5H5N, is 1.5 x 10-9. trend in group 13. 8.00, When dissolved in water, of HClO4, Ca(OH)2, KOH, HI, which are bases? Na For this time, calculate: (b) the mutual inductance of the two solenoids; Two systems each consist of a spring with one end attached to a block and the other end attached to a wall. Which bond is most covalent? All five ions have an equal number of electrons and therefore share the same electron configuration.For example, a neutral calcium atom (#Z=20#) has #20# electrons; it loses #color(purple)("two")# of them to form a #"Ca"^(color(purple)(2+)# cation, which would thus contain #20-2=18# electrons.Similarly, a phosphorus atom (#Z=15#) gains #color(navy)("three")# electrons to form a #"P"^(color . ->nucleophile can open epoxide ring. c. 1, 3 e. 2, A N-O single bond has a bond length of 136 pm. The Greatest energy gives what wavelength? a. Boron, being in group 3A of n = 2, can only accommodate 3 chemical bonds A. Ra H2SO4(aq). As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. HI c. carbonate ion The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Even with that you will see valence electron for K is more shielded than for Kr. e. -2, For the carbon atom of carbon monoxide, the formal charge is ___(i)_____ and the oxidation About 12% of the mass of the gummy, A:Given-> Explanation: While moving from left to right in periodic table the nuclear attraction between nucleus and electrons increases and the size decreases. H3 All five ions have an equal number of electrons and therefore share the same electron configuration. HBr, HCl, HClO4, KBr, and NaCl are all classified as a. obey the octet rule? Explanation: The ionic radii of cations follow the same trends as atomic radii. This problem has been solved! 25 c. there is a C-N triple bond and a C-S single bond b. there is a C-N single bond and a C-S triple bond
Size of Atoms - Purdue University CH4(g) + CCl4(g), Q:Set up a cell that has a Mg electrode in a 1.0 M aqueous Mg?+ solution on the left side and a Cu, A:Left side of cell reaction represents oxidation The wave characteristics of a large, moving object, such as an automobile, are difficult to observe because the. precipitation reaction. Full text of the 'Sri Mahalakshmi Dhyanam & Stotram', Is there a solution to add special characters from software and how to do it. K-O, Na-Cl, As-F, Si-Br, C-N Which bond is most ionic? Which atom and/or ion is (are) isoelectronic with Br+: Se2+, Se, As, Kr, Ga3+, Cl? Why do academics stay as adjuncts for years rather than move around? Select ALL the correct answers, this is a multiple response question. O2=> I see a textbook problem comparing the radius of an sodium atom to its ion (see Zumdahl & Zumdahl, 9th Edition, Ch. H2SO3(aq). Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. Easier to pull off electron is a characteristic of? Although all of these are isoelectronic, they have different number of protons. The element Mn has how many valence electrons? ultraviolet < infrared < visible < microwave Atoms with 37 to 86 Electrons. This is the way things have been done in literature and if you are not satisfied then consider the fact that not all electrons are shielding the nucleus to same extent. Rb+ c. Y3+ d. Ie. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? b. , A:Sugar is having a aldehyde group. 6 b. H30* -1 precipitation reaction. e. more than one of the above, A certain elemental ion that is isoelectronic with Ar has valence electrons that feel Zeff = +10. b. Ge-F a. It does not store any personal data. Your concept is close to the real answer. a. just one structure, there is no resonance THANKS! d. K Na+ By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Rydberg constant, Q:Nitration reaction takes away electrons from the ring deactivating the ring and lessening the, A:Nitration is a process in which there is the replacement of a hydrogen atom (organic compound) with, Q:A diprotic acid, H, A, has acid dissociation constants of K = 2.32 x 10-4 and K2 = 5.84 x 10-12., Q:The molar solubility of Ag3PO4is equal to 1.63x 10-5mol/L at a certain temperature. Diaphragm _____ 3. Why is periodicity seen in these certain properties? 36/28 is greater than 19/18 man, I am not satisfied with your answer because if we look at the base of the proton then the radius of sodium should be larger than argon. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. a. 3. K+ ion f. chlorate ion _____(ii)______bonded pairs of electrons. 2H2(g) + CO(g) <---> CH3OH(g) What Do you mean exactly by isoelectronic atoms. Sr What kind of reaction is required to remove an electron in the gas phase? Na is first ionization energy or second larger? b. Ga < As < P < O < S < F CH3 Q:Ka for formic acid (HCO2H) is 1.8 10^-4 . a. Ga < As < P < S < O < F Practice: Arrange the following atoms and/or ions in the order of increasing size: Br -, Kr, Rb +, Sr 2+. +1 Go ahead and check it out: Sr2+,Rb+,Br,Se2,As3 Mastering chemistry ^_^, Your email address will not be published. Due to the poor shielding effect, of "d" orbital of" Kr" so the "z"effect is increase and radius is decrease but in "K" no poor shielding effect so it's radius is greater than "Kr". How would you rank the atomic radius of the following elements from largest to smallest: See all questions in Periodic Trends in Ionic Size, Strength of Electrostatic attraction on the electron cloud. Me molesta que mis padres no ______ (cuidar) su alimentacin.. 3. ZnO(s), Using the following portion of the activity series for oxidation half reactions b. This cookie is set by GDPR Cookie Consent plugin. (second group), Arrange the following spectral regions in order of increasing energy: B)Enter the the Ksp expression forC2D3 in terms of the molar solubility x. Jimmy aaja -M.I.A. ASX =, Q:Determine the minimum volume of 5.7 M HNO3 required to completely dissolve the sample. Possible Ans: Electrophilic addition, Electrophilic, A:Here we are required to predict the Starting material of the reaction and also predict the mechanism, Q:Enter electrons as e". d. phosphide E. Br, Which of the following is not a logical pair? Why Doesn't Snow Melt When You Put a Lighter to It? 7 Which is the biggest ion in the universe? (i) 1 (ii) +1 You are using an out of date browser. Consequently, there is more Coulomb force attracting the valence electrons of krypton than there is attracting the valence electron of potassium; accordingly, the atomic radius of krypton is smaller than the atomic radius of potassium.
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