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15-05-2018
Chemistry

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Which ion has the same electron configuration as a Mg2+ ion? A Na+ B Ca2+ C S2- D Cl-

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24-05-2018

electron configuration of Mg is - [Ne] 3s²
Mg²⁺ ion is formed after the two outer shell electrons are removed and the new configuration is [Ne]

options given and their respective electron configurations are as follows
A. Na⁺ - [Ne]
B. Ca²⁺ - [Ar]
C. S²⁻ - [Ar]
D. Cl⁻ - [Ar]

the ion with same electron configuration as Mg²⁺ is Na⁺
answer is A . Na⁺

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