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Chapter 3: Problem 54

Give an example of an ionic compound where both the anion and the cation are isoelectronic with each of the following noble gases. a. Ne b. Arr c. Kr d. Xe

Short Answer

Expert verified
a. Sodium fluoride (NaF) b. Potassium chloride (KCl) c. Rubidium bromide (RbBr) d. Cesium iodide (CsI)

Step by step solution

01

a. Ne (Neon)

The electron configuration of neon is 1s² 2s² 2p⁶. An ion is isoelectronic with Ne if it has the same number of electrons (10 electrons). To find possible cations and anions, we look for elements which lose or gain electrons to achieve this configuration. Possible ions that are isoelectronic with Ne: Sodium cation (Na⁺) and Fluorine anion (F⁻). Na⁺ has 1s² 2s² 2p⁶ configuration and F⁻ has 1s² 2s² 2p⁶ configuration. Ionic compound: Sodium fluoride (NaF).
02

b. Ar (Argon)

The electron configuration of argon is 1s² 2s² 2p⁶ 3s² 3p⁶. An ion is isoelectronic with Ar if it has the same number of electrons (18 electrons). Possible ions that are isoelectronic with Ar: Potassium cation (K⁺) and Chlorine anion (Cl⁻). K⁺ has 1s² 2s² 2p⁶ 3s² 3p⁶ configuration and Cl⁻ has 1s² 2s² 2p⁶ 3s² 3p⁶ configuration. Ionic compound: Potassium chloride (KCl).
03

c. Kr (Krypton)

The electron configuration of krypton is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶. An ion is isoelectronic with Kr if it has the same number of electrons (36 electrons). Possible ions that are isoelectronic with Kr: Rubidium cation (Rb⁺) and Bromine anion (Br⁻). Rb⁺ has 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ configuration and Br⁻ has 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ configuration. Ionic compound: Rubidium bromide (RbBr).
04

d. Xe (Xenon)

The electron configuration of xenon is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶. An ion is isoelectronic with Xe if it has the same number of electrons (54 electrons). Possible ions that are isoelectronic with Xe: Cesium cation (Cs⁺) and Iodine anion (I⁻). Cs⁺ has 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ configuration and I⁻ has 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ configuration. Ionic compound: Cesium iodide (CsI).

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