1.

Which of the following electronic configuration is/are wrong? 1. 1s^2 2s^(2)2p_(x)^(2)2p_(y)^(1) (for nitrogen) 2. 1s^(2)2s^(2)2p_(x)^(2)2p_(y)^(1)2p_(z)^(1)(for oxygen) 3. 1s^2 2s^2 2p^6 3s^(2)3p^(6)3d^(5)4s^(1) (for chromium) 4. 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)4s^(2) (for iron)

Answer»

1 and 3
3 and 4
1 only
2 only

Answer :C


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