Question

if n is equal to 6 the correct sequence for filling of electrons will be ​

Answer 1

Aufban principle (n+l rule):Electron will fill orbit by sum of quantum numbers n and l. Orbitals with equal values of n+l will fill with the lower n values first.Since n=6 :ns⇒6s, n+l=6+0=6ns⇒6s,n+l=6+0=6np⇒6p, n+l=6+1=7np⇒6p,n+l=6+1=7(n−1)d⇒5d, n+l=5+2=7(n−2)f⇒4f, n+l=4+3=7Since in last three value of n+l value is same. Therefore we will with the lower n values first so correct sequence will be option (B)