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Here is the detailed solution
may I know how you have taken N value as 3 ..what is the value of L?
Here L is the orbital angular momentum and N is the number of electrons in the valence shell ... so 2p³ is the valence shell, here L = 1 and N = 3 . Got it ?
5p³ is the valence shell, all others are fully filled, as we know that there is a fixed value of L for s,p,d,f as 0,1,2,3 so for p, L = 1 and N = 3