The following table represents the first 20 elements of the Periodic table (the symbol and the electronic configuration for the outermost shell for each of the 20 elements are given).
IA | 0 | ||||||
H 1 | IIA | IIIA | IVA | VA | VIA | VIIA | He 2 |
Li 2,1 | Be 2,2 | B 2, 3 | C 2,4 | N 2,5 | O 2,6 | F 2,7 | Ne 2,8 |
Na 2,8,1 | Mg 2,8, 2 | Al 2,8,3 | Si 2,8,4 | P 2,8,5 | S 2,8,6 | Cl 2,8,7 | Ar 2,8,8 |
K 2,8,8, 1 | Ca 2,8, 8, 2 |
Nitrogen has _____ electrons in its outermost shell.