Q. 35.0( 1 Vote )

Pick out the wrong ones from the subshell electronic configurations given below.

a) 1s2 2s2 2p7

b) 1s2 2s2 2p2

c) 1s2 2s2 2p5 3s1

d) 1s2 2s2 2p6 3s2 3p6 3d2 4s1

e) 1s2 2s2 2p6 3s2 3p6 3d2 4s2

Answer :

The wrong electronic configurations are a), c), d).

In a) 1s2 2s2 2p7, p subshell can have a maximum of only 6 electrons.


In c) 1s2 2s2 2p5 3s1, According to Aufbau rule electrons will be filled first in that subshell which has less energy and when less energy subshell will become full filled then after this next subshell will be filled.


In d) 1s2 2s2 2p6 3s2 3p6 3d2 4s1, here 4s subshell will be full filled first and after this 3d subshell will fill because 4s subshell has less energy than 3d subshell.


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