2. The ionization energy of an element is defined as the amount of energy required toremove an electron from an individual atom. The following table gives the ionizationenergy (in units of kilojoules per mole) for five metals, listed in alphabetical order. Locateeach of these metals on the periodic table and arrange them in order of rows and columnsas in the periodic table.(a) Describe the periodic trend in the ionization energy of elements within a group.(b) Describe the periodic trend in the ionization energy of elements across a period.MetalCalciumMagnesiumPotassiumSodium StrontiumIonization Energy590738419496549Materials

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Answered: 2. The ionization energy of an element…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter5: Electron Configurations And The Periodic Table

Section: Chapter Questions

Problem 117QRT

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(a) Which ion is smaller, Co3+ or Co4+? (b) In a lithium-ionbattery that is discharging to power a device, for every Li+that inserts into the lithium cobalt oxide electrode, a Co4+ion must be reduced to a Co3+ ion to balance charge. Using the CRC Handbook of Chemistry and Physics or other standardreference, find the ionic radii of Li+, Co3+, and Co4+. Orderthese ions from smallest to largest. (c) Will the lithium cobaltoxide cathode expand or contract as lithium ions areinserted? (d) Lithium is not nearly as abundant as sodium.If sodium ion batteries were developed that function in thesame manner as lithium ion batteries, do you think “sodiumcobalt oxide” would still work as the electrode material?Explain. (e) If you don’t think cobalt would work as the redox-active partner ion in the sodium version of the electrode,suggest an alternative metal ion and explain your reasoning.
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