Which element of the following not possesses half filled valence shell with electron ?

Options

A. C
B. O
C. Ne
D. N

Answer

A

Explanation

Carbon (Z - 6) has electron configuration `1s^(2) 2s^(2) 2p^(2)` The valence shell (n = 2) has 4 electrons b u t the valence shell (n = 2) can be o c c u p ie d by m axim um 8 electrons. This rep resen ts th a t valence shell of carbon atom is h alf filled