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Why c is not correct And b is correct tell me why this happens

Why c is not correct
And b is correct tell me why this happens 
 

Question Image
Grade:12th pass

1 Answers

Unicorn
96 Points
one month ago
Electronic confign are :;
 
 
C 2+ - 1s2 2s2
K+ - 1s2 2s2 2p6 3s2 3p6 
Na - 1s22s2 2p6 3s1 
Ca+ - 1s2 2s2 2p6 3s2 3p6 4s1 
 
As u can see in potassium we have have to pick out electron from fully filled p subshell hence highest energy required here 
 
Do upvote::))
 
 

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