Question

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

Answer 1

Answer:

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

(A) is correct option.

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.