Question

indicate the number of unpaired electron in fe ( z =26​

Answer 1

Answer: Four unpaired electron.

Explanation:

The electronic configuration of Fe is [Ar]4s2,3d6

But d has five orbitals to be filled. So first every electron is filled in five respective orbitals but the last electron goes the first orbital to get paired up since there is no electron remaining the electrons in other four are unpaired. For more description refer the picture.

Answer 2

The number of unpaired electrons in Fe (Z= 26) is four.

• The electronic configuration of Fe (Z=26) =  [Ar] 4s² 3d⁶
• The maximum number of electrons in the d orbital is ten, but only six are present, implying that the element has some unpaired electrons.
• The electrons will now be singly occupied in the d-orbital before pairing, according to Hund's Rule.
• So, first, each electron is assigned to one of five orbitals, and the last electron is assigned to the first orbital to be paired up. Because there is no longer one electron, the electrons in the other four orbitals will be unpaired.
• As a result, four electrons in the d-orbital will be left unpaired.