Answers

2014-09-22T23:09:43+05:30
Electronic configuration of
(i)boron 
 GS:1s² 2s² 2p¹
1st ES:1s² 2s¹ 2p²
(ii)carbon
 GS:1s² 2s² 2p²
1st ES:1s² 2s¹ 2p³
(iii)nitrogen
  GS:1s² 2s² 2p³
(iv)oxygen
  GS:1s² 2s² 2p⁴
(v) fluorine
  GS:1s² 2s² 2p⁵

nitrogen , oxygen and fluorine do not have excited state as they cannot have more than two orbitals.
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