The electronic configuration of calcium ion, Chemistry

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The electronic configuration of calcium ion ( Ca2⁺) is:

(1) 1s¹, 2s^2, 2p⁶, 3s², 3p⁶, 4s²

(2) 1s¹, 2s², sp⁶, 3s², 3p⁶, 4s¹

(3) 1s¹, 2s², 2p⁶, 3s², 3p⁶, 3d²

(4) 1s¹, 2s², sp⁶, 3s², 3p⁶, 3d⁵

(5) 1s¹, 2s², 2p⁶, 3s², 3p⁶, 4s⁰

Ans:1s¹, 2s^2, 2p⁶, 3s², 3p⁶, 4s⁰

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