Question

Which of the following electronic configurations is not possible: O Li-3: 1s22s1 O N-7: 1s22s22p3 Ne-10: 1s22p6 352 O K-19: 152 2s22p6 3s 3p6 451 O All of the above configurations are possible. No new data to sa

Answer 1

Answer :--

electronic configuration of

(a) Li = 1s² 2S¹

SINCE atomic number of the Li = 3

so option (1) is correct .

(b) N = 1s² 2s² 2p³

i.e. ---- 2, 5

since the atomic number of the Nitrogen = 7

so option(2) is correct.

(c) Ne = 1s² 2s²2p⁶

which is as according to the Afbau principle

so this option is incorrect .

(d) K = 1s²2s²2p⁶3s²3p⁶4s¹

so this option is also correct