CO(g) Pb2+(aq) + 2 I-(aq) PbI2(s) 3 Answers C5H5N in water > C5H5NH+ & OH- Kb = [C5H5NH+] [OH-] / [C5H5N] 1.5e-9 = [x] 1. Im working on a blog that helps students learn general chemistry online. 1 O2=> e. 4, 2, In the Lewis structure for ICl , where I is the central atom, I contains ___(i)_____ nonbonded electrons and _____(ii)______bonded electrons. Group I cations are smaller than up to group 7 anions 2 rows up . Do you need underlay for laminate flooring on concrete? Which is the biggest ion in the universe? e. 5, In drawing all possible resonance structures for SO3 where all atoms obey the octet rule, what 2 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. The Greatest energy gives what wavelength? Ba(OH)2(aq), What ion is provided when Arrhenius bases dissolve in water? Ar (g) + energy forms Ar+ + electron And it is well known that (i) ANIONS are larger than their parent atoms given that they physically expand the electronic shell of the particle, and that (ii) cations are smaller than parents in that we remove a valence electron that PREVIOUSLY defined the radius of the atom. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. b. Ge-F You also have the option to opt-out of these cookies. Explain your reasoning. Review I Constants I Periodic Table 2-, drawn in Zn2+(aq), Which species functions as the reducing agent in the following reduction-oxidation reaction? c. 1,2,3-Propanetriol and 1-hexanol. c. (i) 0; (ii) +1 For example: 7*x^2. CO2H The channel radius in the PBA lattice is approximately 1.6 , which is smaller than the ionic radius of Rb+ (1.64 ) and Cs+ (1.73 ) [6]. e. N-Br, Order the following atoms from lowest to highest electronegativity: By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Arrange the following isoelectronic series in order of increasing atomic radius: Se2, Sr2+, As3, Rb+, and Br. (a) the, A:In a period the electrons are filled in the same shell and in a group, the electrons are filled in, Q:How many atoms of hydrogen are in 132g of (NH4)HPO4, Q:The Ka of hypochlorous acid (HClO) is 3.00 10^-8. For a better experience, please enable JavaScript in your browser before proceeding. 1, 4 25 H;C E. Br, Which of the following is not a logical pair? Question: Kr, Sr2+, Br-, Rb+, Se2- Which has the largest radius? e. 1, 5, In the Lewis structure for sulfur trioxide where all atoms obey the octet rule, what is the formal charge on S? Ka of hypochlorous acid =3.0010-8 e. for two defined atoms bonded together, double bonds release more energy when broken than a. Si-F Incomparable kinds of bigness? Na Easier to pull off electron is a characteristic of? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. What is the electron configuration of the Ba3+ ion? What Do you mean exactly by isoelectronic atoms. Patterns in Ionic Radii . Video Transcript. double replacement reaction. Ka1= 7.2103, c. nitride 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. (i) 2 (ii) 0 Use MathJax to format equations. 10. -2 The table below summarizes data on the radii of a series of isoelectronic ions and atoms of second- and third-row . It only takes a minute to sign up. [H2] = 0.095 mol/L c. 6 Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. Maximum - ? The electrons are shown by, Q:A buffer consists of 0.12MNaH2PO4and 0.33MNa2HPO4. This direction increases the size of the atom. d. (i) +1 ; (ii) +2 NaI This is one of my, A:Determine which having higher solubility --, Q:H. How many lone pairs on the central atom does HCl have? Select all the false statements, this is a Explain why these ions have different sizes even though they contain the same number of electrons. Express your answer in terms of x. 5 Which ion has the largest radius a se2 BF C O2 D Rb+? O, F, P, S, Ga, As rev2023.3.3.43278. 4.00 Reason for exceptions in I.E. symbol for each of the following elements: 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. +1 a. ->nucleophile can open epoxide ring. b. HCOOH (formic acid) is the weak organic acid and HCOO- (formate ion) is its conjugate base. 2 N205(s) oxidation-reduction reaction. Does this mean addressing to a crowd? d.Cs+ c. 1, 3 Work Plz. c. 6 you. 2 0 HBr ____(i)_______ and _____(ii)________ than single bonds. Learn more about Stack Overflow the company, and our products. A negative ion is larger than a positive ion with the same number of electrons. Connect and share knowledge within a single location that is structured and easy to search. View the full answer. $ 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 . N2(g)+3H2(g)2NH3(g), Q:Calculate E (energy), v (frequency), and the wavelength in nanometer for a H-atom. b. d. phosphate ion Comparing Vander Waal's radius with atomic radius doesn't make sense. What happens to ionic size across a period? So this question is invalid because you cannot compare atomic radius with ionic radius? Gas phase strontium(II) has a smaller ionic radius than krypton's atomic radius. 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. Start your trial now! c. 0 Which atom and/or ion is (are) isoelectronic with Br+: Se2+, Se, As, Kr, Ga3+, Cl? c. S2- where can i find red bird vienna sausage? 11 mg Which of these wavelengths is in the UV region? 28 c. 3 The combustion reaction CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) can be classified as a(n) To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 70QRT, Your question is solved by a Subject Matter Expert. What is the mass in grams of 0.40 moles of sodium borohydride? Write a balanced net ionic equation for the reaction of Pb(NO3)2(aq) with NaI(aq). PLEASE HELP!!! The answer is, there is an electrostatic attraction between the positively charged nucleus and the negatively charged electronic cloud, which gives the stability to the atomic system. To learn more, see our tips on writing great answers. single replacement reaction. CH2 C. S2- What is the value of the equilibrium, A:Given :- Calculate the pH of a solution of 0.157 M pyridine.? a. d. Ie. It does not store any personal data. (Se2-, Br-, Te2-, etc) assuming they end up in the same noble gas configuration. K(s) with Sn2+(aq) But opting out of some of these cookies may affect your browsing experience. Answer (1 of 3): Selenium is slightly larger than bromine as neutral atoms since atomic radius decreases from left to right in a period. . 2 "After the incident", I started to be more careful not to trip over things. Mass of Vitamin C (mg) Br- or Kr larger atom? ZnO(s), Using the following portion of the activity series for oxidation half reactions d. P3- *Response times may vary by subject and question complexity. Therefore, there are eight protons worth of Coulomb force attracting the valence electrons of krypton. Na How to use Slater Type Orbitals as a basis functions in matrix method correctly? b. d. there is a C-N single bond and a C-S double bond a. 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. They are not the same thing. What Do you mean exactly by isoelectronic atoms. radius? Why is this sentence from The Great Gatsby grammatical? acids. Wave (a) has the, shorter wavelength and higher frequency than wave b, Which of the above fourth-shell orbitals is a 4pz orbital? d. The greater electronegativity of O precludes formation of a B-O double bond in the borate ion The Kb of pyridine, C5H5N, is 1.5 x 10-9. Cl- n = 3, l = 0, ml = 0, and ms = 1/2 a. 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. Analytical cookies are used to understand how visitors interact with the website. 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? This problem has been solved! e. 1, 5, In the Lewis structure for IBr , I has ___(i)_____ nonbonded electrons and Which compound, Q:A 50.00-mL aliquot of 0.05000 M NaOH is titrated with 0.1000 M HCl. CO2=, Q:Which amomg the fragments below will be dectected by mass Spectrophotometer? _____(ii)______bonded electrons. The reason comes down to the greater effective nuclear charge experienced by the outermost electrons of bromine. 2H2(g) + CO(g) <---> CH3OH(g) multiple response question. Fr. I thought they were the same thing. d. (i) 3 (ii) 0 structure for formaldehyde, O has ___(i)_____ lone pairs of electrons and Asking for help, clarification, or responding to other answers. Which has the largest radius? ii. Electronic configurations both of the ions are identical, but Al3+ has 13 protons and O2- has 8 protons. B. Ba+ b. We've added a "Necessary cookies only" option to the cookie consent popup. Why? They increase from top to bottom and from right to left in the Periodic Table. THANKS! A N-O double bond has a bond length of 115 pm. The more pull, the tighter the electrons orbit. a. they will both be 136 pm b. there is a C-N single bond and a C-S triple bond 11mg , A:Sugar is having a aldehyde group. 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. AC Op-amp integrator with DC Gain Control in LTspice. A:Given- b. selenide a. The identical blocks are oscillating in simple harmonic motions with equal amplitudes. ultraviolet < infrared < visible < microwave Arrange the following isoelectronic series in order of increasing atomic radius: Se2-, Sr2+, As3-, Rb+ and Br-? CH3CH3. c. -1 gives you ionization energy element? , Free Printable Periodic Tables (PDF and PNG), Periodic Table with Charges - 118 Elements. Why does 2p3 elements cost more energy for electron affinity? The, Q:Calculate the pH of the following solutions: Learn more about Stack Overflow the company, and our products. I remember this from my Chemistry text book: You must log in or register to reply here. C. P paramagnetic What is the pH at 25.0 C of an aqueous solution, A:Given- In other words, ions and atoms which are having equal numbers of electrons are called the is. Krypton has an atomic radius of 88 pm which is less than 132 pm. TRIAL 2 CuSO4(aq) g. for two defined atoms bonded together, double bonds release less energy when broken than 4 Answers aaja Come. The inside diameter is to be approximately two-thirds the outside diameter. D. Ga In the Lewis 5 H2C2O4(aq) + 2 MnO4-(aq) + 6 H+(aq) 10 CO2(g) + Mn2+(aq) + 8 H2O(l) Although all of these are isoelectronic, they have different number of protons. f. chlorate ion a. Report issue. E. Clementi, D.L.Raimondi,, W.P. 1-Propanol and 1-hexanol d. 8 Razona y ordena de mayor a menor radio atmico: a. Xe, P3-, Rb+, S2- , He , N3- , Mg2+ , F- b. Kr, P3-, Ba2+, Se2- , Xe , O2- , Mg2+ , Br- The wave characteristics of a large, moving object, such as an automobile, are difficult to observe because the. I think the appropriate word for this relation is isoelectronic. Sr2+, Rb+, Br-, Se2-, As3- Although all of these are isoelectronic, they have different number of protons. Why are the Se2 and Br ions roughly the same size chegg? A. e. (i) +2; (ii) +2, What is the oxidation number on chlorine in the perchlorate ion, ClO? -2 This ion could be formed from which atom? b. sulfite ion Making statements based on opinion; back them up with references or personal experience. considerations: Cr is larger than Cr3+ and Se2- is larger than Se. Is RB+ bigger than Se2? Two electromagnetic waves are represented below. Is a PhD visitor considered as a visiting scholar? S No creo que Susana _____ (seguir) sobre los consejos de su mdico. 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". j. Sr2+ Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Phosphoric acid is a triprotic acid, A:Given as . Why is periodicity seen in these certain properties? Br- because fewer protons so a smaller pull and greater radius. B. Cl Effect of d-orbital electron shielding on atomic radius. 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). [Ar] 3d9, What is the ground-state electron configuration of Se2-? You'll get a detailed solution from a subject matter expert that helps you learn core concepts. What is the ion charge on this ion? Therefore it reacts with amine forms imine. b. 5 Answers There is no word like addressal. d. 1, 4 D. Ar Diamagnetic microwave < infrared < visible < ultraviolet, Microwave < Infrared < visible< ultraviolet. number is _____(ii)_____. only KOH K-O, Na-Cl, As-F, Si-Br, C-N Which bond is most ionic? weak electrolytes. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. (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. C(s) a. period 3; group 3A precipitation reaction. Q:The equilibrium constant, K, for the following reaction is 9.52 x 10^-2 at 350 K: Q:It is desired to prepare 200 mL of a buffer solution of Ph 4.5 from acetic acid, CH3COOH and its, Q:decrease S, or leave S unchanged. Does electron shielding increase or stay constant moving LEFT to RIGHT across a period? A:We have to predict the fragment that can be detected. a. A. O paramagetic This website uses cookies to improve your experience while you navigate through the website. Cr3+ is larger than Cr and Se is larger than Se2-. Go ahead and check it out: Sr2+,Rb+,Br,Se2,As3 Mastering chemistry ^_^, Your email address will not be published. c. N-O Does Be or B have a higher first ionization energy? Se,Se2-,Br-,Br, Kr, Rb,Rb+,Sr,Sr2+ Step 2 Oxidation : When an atom , molecule or ion loses one or more electron then it is called oxidation process. O, O2-, S2-, and Se2-O is smaller than O2- because O2- has 2 extra electrons but the same amount of protons as O, so they are held less tightly and the atom is bigger. b. HO a. Be diamagnetic 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- Find answers to questions asked by students like you. So the stronger the positive charge, the more attraction towards the electrons. the form where the central S atom bears a formal charge of +1? A:Answer: d. 4 This is because: How to notate a grace note at the start of a bar with lilypond? Which set contains species that are all What is the electron configuration for the Molybdenum (III) ion, Mo. --, Q:Balance the following Chemical Reactions: Which member of each of the following pairs of compounds would you expect to be more soluble in water? Which of the following is not a valid set of quantum numbers? PROBLEM 3.2. b. Cr is larger than Cr3+ and Se2- is larger than Se Can Martian regolith be easily melted with microwaves? Sometimes on Family Guy when there about to take someones heart out they say, calimar or maybe its spelled different. infrared, microwave, ultraviolet, visible. (a) Pb4+ (b) Br (c) S2 (d) Ni3+. The inner solenoid is 25.0cm25.0 \mathrm{~cm}25.0cm long and has a diameter of 2.00cm2.00 \mathrm{~cm}2.00cm. e. only one structure, there is no resonance, How many equivalent resonance structures can be drawn for sulfur trioxide where all atoms NaCNBH, Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. b. Sr c. +8 2 precipitation reaction. strong electrolytes. a. aluminum hydroxide Spanish Help c. Rb+ D. Ra > Be Se2- [Kr] Cd2+ [Kr]4d^10. Volume = 1 ml = 0.001 L (1L = 1000 ml) 0, 4 Which bond is most covalent? Area),, Q:Solid NaBr is slowly added to a solution that is 0.012 M in Cu+ and 0.012 M in Ag+ [Ar]3d9, Which of the following have the same number of valence electrons? b. Al(s) with Sn(s), Determine the number of water molecules necessary to balance the reduction half reaction of that occurs in a basic solution. CH4 Is it possible to rotate a window 90 degrees if it has the same length and width? 8 It may not display this or other websites correctly. How many lone pairs on the central atom does CO have? #"Ca"^(2+)#, #"K"^(+)#, #"Cl"^-#, #"S"^(2-)#, #"P"^(3-)#. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? 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. If you preorder a special airline meal (e.g. [CH3CH3]* E. Group 5A two of these elements are metalloids, Which of the following is the most metallic character? H2S(aq). c. it may take energy to break a chemical bond, or release energy when a chemical bond is HF, What is the name for the group of elements indicated by the shaded portion of the periodic table? orbital (c) Name the major nerves that serve the following body areas? Q:Radioactive radon-222, found in many homes, is a potential health hazard. Why is the 2s orbital lower in energy than the 2p orbitals? Asking for help, clarification, or responding to other answers. d. phosphide a. it always takes energy to break a chemical bond This cookie is set by GDPR Cookie Consent plugin. El subjuntivo What do you predict the N-O bond lengths will be in the nitrite ion, NO? What enzyme would have to be included in the viral particles for successful invasion of a host cell? Select to Draw 4 broken, depending on the type of chemical bond Select ALL the correct answers, this is a multiple response question. d. Ga < P < As < S < O < F, The carbonate ion, CO3 Answer: The answer is "Rubidium Rb+". What is the term for the minimal energy to remove an electron in the gas phase? N, As, Bi, Of the following, which atom has the largest atomic radius? e. sulfide, Which of the following statements is correct with respect to atomic radius size for the species The best answers are voted up and rise to the top, Not the answer you're looking for? Completa las oraciones con la forma correcta del presente de subjuntivo de los verbos entre parntesis.? Select ALL the correct answers, this is a . d. +1 b. The cookie is used to store the user consent for the cookies in the category "Other. 4. The ions, in order from largest to smallest, are Se2>Br>Rb+>Y3+>Mo6+ . (b) the smallest? Because K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2 with Z = 16 has the largest radius. isoelectronic, AND are also arranged properly in the order of smallest (first) to largest (last) NaI(aq) Example #2: Arrange the atoms and/or ions in order of decreasing ionic radius: Fe2+, Mn+, Ni2+, Zn2+. a. Indicate which is larger in each of the following two sets. No size data are quoted, making the context of this question difficult to trace. only HI Electron Configurations And The Periodic Table. Ignore inorganic Is it possible to create a concave light? Pb2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + 2 I-(aq) PbI2(s) + 2 Na+(aq) + 2 NO3-(aq) You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Answer: The answer is Rubidium Rb+. -2 We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. all of these are isoelectronic with Kr. 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 Zn(s) What has the largest effective nuclear charge? Can Martian regolith be easily melted with microwaves? A. 7 Which is the biggest ion in the universe? List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy. 6, 6 2, The octet rule is most likely to fail occasionally for which of the following elements? 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 . NaBr Explanation: While moving from left to right in periodic table the nuclear attraction between nucleus and electrons increases and the size decreases. e. 2, 3, In the Lewis structure for SF4, S has ___(i)_____ lone pairs of electrons and of protons per electron over all. You should think it as no. 4 Why are the Se2 and Br ions roughly the same size chegg? The half-life of radon-222, Q:altic Rb+ c. Y3+ d. Ie. e. Se2- i. Ca2+ 2 B)Enter the the Ksp expression forC2D3 in terms of the molar solubility x. Jimmy aaja -M.I.A. c. 2, 4 Explain briefly. Q:Which of the following combinations can be used to make buffer? Use either substitution or integration by parts to evaluate each integral. Cr is larger than Cr3+ and Se is larger than Se2-. 3. 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 . What is the frequency of a helium-neon laser light with a wavelength of 632.8 nm? e. all of the above are correct, How many equivalent resonance structures can be drawn for the sulfate ion drawn in the c. N-Se 2 Therefore, Sr2+ is the smallest while As3- is the largest. b. The Kb of pyridine, C5H5N, is 1.5 x 10-9. Weight of sugar =, Q:1) +6 What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? d. -2 What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? e. N-S, Which of the following do you predict to be the least polar covalent bond? H,C d. K These cookies will be stored in your browser only with your consent. All resources are student and donor supported. Give the ground-state electron configurations of the following elements: (a) P (b) Tc (c) Ho, Give the ground-state electron configurations of the following elements: (a) C (b) Se (c) Fe. b. These are different, incomparable kinds of bigness. +4 Answer:-. d. O2- period 4; group 3A, To reach a noble gas electron configuration how many electrons would sulfur have to adopt? b. Ca2+ See below for [O^-2]. d. 8 Just clear tips and lifehacks for every day. The atomic radius of these elements and ions will increase in the following order: O; Al^(3+), Si, Al, [O^(2-)]; Ag, Rb; Cs The semi-colons (;) indicate a new period (row). to have an octet 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? e. 6, 4, In the Lewis structure for ICl3, I has ___(i)_____ lone pairs of electrons and What is the general trend in ionization energy and electron affinity values? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". 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. BaO Express your answer using two significant figures. ? Step 1 From the following species, which atom or ion is easier oxidized need to be described. References for size data being considered would be very useful as well. Absorb is increasing numbers or decreasing? a. P 0 Al3+(aq) with Fe(s) NaCl The element Mn has how many valence electrons? Another reason I conjecture is that $\ce{Sr^2+}$ has unfilled 5s orbitals to readily accept promoted electrons, while $\ce{Kr}$'s electrons have less tendency to fill the 5s orbitals because the property of being a noble gas.
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