Multiple Choice Question Answer XVII — task. Science CBSE, Class 9.

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1. Number of unpaired electron in 1s2, 2s2, 2p4

2
4
0
1

2. Electronic configuration of Cr is –

(Ne) \(3s^2\), \(3p^6\), \(3d^3\), \(4p^1\)
(Ne) \(3s^2\), \(3p^6\), \(3d^4\), \(4s^2\)
(Ne) \(3s^2\), \(3p^6\), \(3d^5\), \(4s^1\)
(Ne) \(3s^2\), \(3p^6\), \(4s^1\), \(4p^3\)

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