# How many unpaired electrons are in an iron atom in its ground state?

1. A

6

2. B

4

3. C

2

4. D

0

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### Solution:

The Atomic number of Fe is 26.

The ground state configuration of Fe is $\left[Ar\right]4{s}^{2}3{d}^{6}$

The electrons are paired, and with six electrons in the $3\mathrm{d}$subshell.  According to Hund's rule, when electrons occupy a group of orbitals with the same energy, such as the five 3d. So, firstly one electron into each orbital will be inserted until they are all halfway full, after which the electrons begin to pair up.

The correct option is B.

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