Question

The pair of ions having same electronic configuration is __________.

(i) Cr3+, Fe3+ (ii) Fe3+, Mn2+ (iii) Fe3+, Co3+ (iv) Sc3+, Cr3​

Answer 1

Answer:

ANSWER

The valence shell electronic configuration of the given atom and their corresponding ions are:

A. Cr(Z=24:3d

5

4s

1

and Cr

3+

:3d

3

Fe,Z=26:3d

6

4s

2

and Fe

3+

:3d

5

thus, Cr

3+

and Fe

3+

have different electronic configuration.

B. Fe,Z=26:3d

6

4s

2

and Fe

3+

:3d

5

Mn,Z=25:3d

5

4s

2

and Mn

2+

:3d

5

thus, Mn

2+

and Fe

3+

have same electronic configuration.

C. Fe,Z=26:3d

6

4s

2

and Fe

3+

:3d

5

Co,Z=27:3d

7

4s

2

and Co

3+

:3d

6

thus, Co

3+

and Fe

3+

have different electronic configuration.

D. Cr(Z=24:3d

5

4s

1

and Cr

3+

:3d

3

Sc,Z=21:3d

1

4s

2

and Sc

3+

:3d

0

thus, Cr

3+

and Sc

3+

have different electronic configuration.

Therefore Fe

3+

and Mn

2+

have the same electronic configuration.