The electronic configuration of Na atom and Na+ ion is: (atomic number of Na is 11)
1
1s2, 2s2, 2p6, 3s1 and 1s2, 2s2, 2p6
2
1s2, 2s2, 2p6, 3s2 and 1s2, 2s2, 2p6
3
1s2, 2s1 and 1s2
4
1s2, 2s2, 2p6, 3s2, 3p6, 4s1 and 1s2, 2s2, 2p6, 3s2, 3p6
5
Other than the above given options.