Question

Correct set of four quantum numbers for valence electron of
rubidium (Z = 37)is
(a) 5,0,0, + 1/2
(b) 5,1,0, + 1/2
(c) 5,1,1, + 1/2
(d) 6,0,0, + 1/2

Answer 1

The set of four quantum numbers for valence electron of  rubidium (Z = 37) is 5,0,0, + 1/2

Explanation:

From the periodic table Z = 37 atomic number belongs to Rubidium.

The valence electronic configuration of Rubidium is

$[\mathrm{Kr}] 5 s^{1}$

That is the valence electron enters in to 5s orbital.

Thus the set of quantum numbers are

Primary quantum number n = 5

Azimuthal quantum number l = 0

Magnetic quantum number m = 0

Spin quantum number s = +1/2 (or) -1/2

Therefore set of quantum number is 5,0,0, + 1/2

Hence the correct answer is option (a)