Write the electronic configuration of (i) Mn4+, (ii) Fe3+ (iii) Cr2+ a

1.	Write the electronic configuration of (i) Mn4+, (ii) Fe3+ (iii) Cr2+ and Zn2+Mention the number of unpaired electrons in each case.
Answer» (i) Mn (z = 25), Mn⁴⁺ (z = 21) The electronic configuration of Mn⁴⁺ to Given by 1s² 2s²2p⁶ 3s² 3p⁶ 3d³ As the outermost shell 3d has 3 electrons, thus the number of unpaired electrons is 3. (ii) Fe (z = 26), Fe³⁺ (z = 23) The electronic configuration of Fe³⁺is given lay 1s²2s²2p⁶3s² 3p⁶ 3d⁵ The number of unpaired electron is 5. (iii) Cr (z = 24), Cr²⁺ (z = 22) The electronic configuration of Cr²⁺ is 1s² 2s² 2p⁶3s² 3p⁶ 3d⁴ The number of unpaired electron is 4. (iv) Zn (z = 30), Zn²⁺ (z = 28) The electronic configuration of Zn²⁺ is 1s² 2s²2p⁶ 3s²3p⁶3d¹⁰ The number of unpaired electron is 0.

Write the electronic configuration of (i) Mn4+, (ii) Fe3+ (iii) Cr2+ and Zn2+Mention the number of unpaired electrons in each case.

Answer»

(i) Mn (z = 25), Mn⁴⁺ (z = 21)

The electronic configuration of Mn⁴⁺ to Given by

1s² 2s²2p⁶ 3s² 3p⁶ 3d³

As the outermost shell 3d has 3 electrons, thus the number of unpaired electrons is 3.

(ii) Fe (z = 26), Fe³⁺ (z = 23)

The electronic configuration of Fe³⁺is given lay

1s²2s²2p⁶3s² 3p⁶ 3d⁵

The number of unpaired electron is 5.

(iii) Cr (z = 24), Cr²⁺ (z = 22)

The electronic configuration of Cr²⁺ is

1s² 2s² 2p⁶3s² 3p⁶ 3d⁴

The number of unpaired electron is 4.

(iv) Zn (z = 30), Zn²⁺ (z = 28)

The electronic configuration of Zn²⁺ is

1s² 2s²2p⁶ 3s²3p⁶3d¹⁰

The number of unpaired electron is 0.