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  4. The value of screening constant (σ) for N-atom is 3.10 and that for O-atom is

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Q. The value of screening constant $(\sigma)$ for $N$-atom is $3.10$ and that for $O$-atom is

Classification of Elements and Periodicity in Properties

Solution:

$N \left(1 s^{2}\right)\left(2 s^{2} 2 p^{3}\right) ; \sigma=3.1 $
$ O \left(1 s^{2}\right)\left(2 s^{2} 2 p^{4}\right) ; \sigma=3.1+0.35=3.45$