Question

Which of the following statement (*) is (are) correct ?

(a) The electronic configuration of Cr is [Ar] 3d5 4s1(Atomic number of Cr = 24).

(b) The magnetic quantum number may have a negative value

(c) in silver atom, 23 electrons have a spin of one type and 24 of the opposite type. (Atomic number of Ag = 47

(d) The oxidation state of nitrogen in HN3 is -3

Answer 1

Correct option (a) (b) (c)

Explanation:

(a) 24Cr =1s2,2s2 ,2p6,3s2, 3p6 ,3d5,4s1,

= [Ar] 3d5, 4s1.

(b) For magnetic quantum number (m) negative values are possible.

For *-sub-shell : l = 0, hence m = 0

For p-sub-shell : I = 1, hence m = - 1, 0, + 1

(c) 47Ag = 1s2,2s2, 2p6,3s2, 3p6,3d10,4s2, 4p6 4d10, 5s1

Hence, 23 electrons have a spin of one type and,24 of the opposite type.

(d) Oxidation state of N in HN3 is -1/3.