Answer :

One mole of sodium vapor has 6.02 × 1023 atoms (Avogadro’s number). A sodium atom has atomic number 11. The electronic configuration of sodium is.


Therefore, there are 2× 6.02 × 1023 = 12.04 × 1023 (number of electrons occupying a state × Avogadro' s number) 1s energy states in one mole of sodium vapor and they are all filled in normal conditions.


Also, there are 1×6.02× 1023 = 6.02× 1023. 3s energy states in one mole. The 3s energy states is partially filled in normal conditions.


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