**Solution —**

We know that 1 mole of atoms contains 6.022 x 10^{23} atoms.

Now,

1 mole of sodium atoms = 6.022 x 10^{23} atoms. So,

0.2 mole of sodium atoms = 6.022 x 10^{23} x 0.2 atoms

= 12.044 x 10^{22} atoms

**Thus, 0.2 mole of Sodium element has 12.044 × 10**^{22 }Atoms in it.