Answer :


Electronic configuration of Sodium atom is 1s22s22p63s1


Each 3s orbit will have two state and one of each would be occupied,


in N atoms of sodium there will be 2N states possible states and N states will be empty.


Given:


mass of the sodium in 1 m3 = 1013 kgm-3


the total number of atoms


=


Therefore, total number of states



And total unoccupied states are


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