A)
B)
C)
D)
Correct Answer: A
Solution :
Electron pairing in p, d and\[f\]orbitals cannot occur until each orbital of a given sub-shell contains one electron or each is singly occupied. \[7N\xrightarrow{{}}1{{s}^{2}},2{{s}^{2}},2{{p}^{3}}\]
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