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  4. How many elements are possible for 1 st period of periodic table if azimuthal quantum number can have integral values from 0, 1,2 ... (n + 1)?

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Q. How many elements are possible for 1 st period of periodic table if azimuthal quantum number can have integral values from $0, 1,2 ... (n + 1)?$

Classification of Elements and Periodicity in Properties

Solution:

$n=1$
$l=0,1,2$
$S,P, d$
$n=2$
$l= 0, 1, 2, 3$
$S,p, d,f$
$1S^{2}\,2P^{6}\,2S^{2}\,3d^{10}$
first period $\to 2+6=8$