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The incorrect electronic arrangement is

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An Intiative by Sri Chaitanya

2, 8, 8, 1

2, 8, 13, 1

2, 8, 8, 2

2, 8, 12, 2

answer is B.

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Detailed Solution

2,8,12,2

1s²2s²2p⁶3s²3p⁶3d⁴4s²This is incorrect electronic arrangement due to stability of atom electron shift from s-orbital to d-orbital so the correct electronic arrangement is 1s²2s²2p⁶3s²3p⁶3d⁵4s¹ (2,8,13,1-Cr)

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