Question

Which of the following notations is the correct noble gas configuration for

Co?
A. [Ar]48237
B. [Ar]4524p63d
O C. [Kr]4s24p64d
D. [Co]48237

Answer 1

The notation of configuration of Co is
`[Ar] 3d^7 4s^2`

(A) is correct option.

Step-by-step explanation:

Given that,

The following notations is the correct noble gas configuration for Co.

(A). [Ar] 3d⁷ 4s²

(B). [Ar] 4s² 4p⁶ 3d

(C). [Kr] 4s² 4p⁶ 4d

(D). [Co] 3d⁷ 4s²

We know that,

Cobalt :

Co is the symbol of cobalt which is a chemical element.

Atomic number of Co is 27.

We need to find the notation of the configuration of noble gas Co

Using configuration

`Co_(27)=2, 8, 15, 2`

`Co_(27)=1s^2, 2s^2,2p^6, 3s^2 3p^6 3d^7, 4s^2`

So, we can write as the notation of noble gas configuration

`Co_(27)=[Ar] 3d^7 4s^2`

Hence, The notation of configuration of Co is
`[Ar] 3d^7 4s^2`

(A) is correct option.