Question

Which of the following three sets consist of atoms or ions with the same electron configuration in the ground state?
(I) O2-, Ne, and Mg2+
(II) Ni, Cu+, and Zn2+
(III) Hg, Tl+, and Pb2+

Answer 1

Answer to Question #50632, Chemistry, Other

Which of the following three sets consist of atoms or ions with the same electron configuration in the ground state?

(I) O²⁻, Ne, and Mg²⁺

(II) Ni, Cu⁺, and Zn²⁺

(III) Hg, Tl⁺, and Pb²⁺

Solution:

(I) O²⁻ [He] 2s² 2p⁶,

Ne [He] 2s² 2p⁶

Mg²⁺ [Ne] 3s⁰ or [He] 2s² 2p⁶

(II) Ni [Ar] 3d⁸ 4s²

Cu⁺ [Ar] 3d¹⁰ 4s⁰

Zn²⁺ [Ar] 3d¹⁰ 4s⁰

(III) Hg [Xe] 4f¹⁴ 5d¹⁰ 6s²

Tl⁺ [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁰

Pb²⁺ [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁰

Answer:

The same electron configuration in the ground state has (I) O²⁻, Ne, and Mg²⁺ and (III) Hg, Tl⁺, and Pb²⁺.

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