Element | At. no | Complete electronic configuration | Valence shell electronic configuration |
---|---|---|---|
Li | 3 | 2, 1 or [He] 2s1 | 2s1 |
Na | 11 | 2, 8, 1 or [Ne] 3s1 | 3s1 |
K | 19 | 2, 8, 8, 1 or [Ar] 4s1 | 4s1 |
Rb | 37 | 2, 8, 18, 8, 1 or [Kr] 5s1 | 5s1 |
Cs | 55 | 2, 8, 18, 18, 8, 1 or [Xe] 6s1 | 6s1 |
Fr | 87 | 2, 8, 18, 32, 18, 8, 1 or [Rn] 7s1 | 7s1 |