JEE Main · 2024 · 27 Jan 2024 · Shift 2 · d and f Block Elements

Choose the correct option having all the elements with d¹⁰ electronic configuration from the following:

Answer: (B)

Solution

d^{10}

configuration means the outer d-subshell is completely filled.

C u

(Z=29):

[A r] 3 d^{10} 4 s^{1}

;

Z n

(Z=30):

[A r] 3 d^{10} 4 s^{2}

;

C d

(Z=48):

[K r] 4 d^{10} 5 s^{2}

;

A g

(Z=47):

[K r] 4 d^{10} 5 s^{1}

— all four have a complete

d^{10}

shell (Cu and Ag adopt the exceptional

d^{10} s^{1}

arrangement for the extra stability of a filled d-subshell). By contrast,

C o

(

3 d^{7}

N i

(

3 d^{8}

F e

(

3 d^{6}

) and

C r

(

3 d^{5}

) all fall short of

d^{10}

, and while

P d

(

4 d^{10}

) is

d^{10}

, it is grouped with elements that are not. Only

C u, Z n, C d, A g

together are all

d^{10}

JEE Main · 2024 · 27 Jan 2024 · Shift 2 · Single correct option