| Usual Classification Nlnl' 2S+1Lπ | Conneely and Lipsky (N, n, α) | Herrick and Sinanoglu n(K, T)N | Sadeghpour
n(υ)N | Lin
A | Lowest N of the series |
| 2pnp 1De | (2, n, a) | n(1, 0)2 | n(0)2 | + | 2 |
| 2pnp 3De | (2, n, a) | n(1, 0)2 | n(0)2 | − | 2 |
| 3pnp 1De | (3, n, a) | n(1, 1)3 | n(0)3 | + | 3 |
| 3pnp 3De | (3, n, a) | n(1, 1)3 | n(0)3 | − | 3 |
| 4pnp 1De | (4, n, a) | n(1, 2)4 | n(0)4 | + | 4 |