Which of the following electronic configuration is not possible?

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1s2 2s2 2p6

1s2 2s2 2p7

1s2 2s2

1s2 2s2 2p5

answer is B.

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Detailed Solution

1s2 2s2 2p7 is impossible configuration. According to Pauli's principle maximum number of electrons in p-subshell is only six.

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