| ⅠA | ⅡA | ⅢA | ⅣA | ⅤA | ⅥA | ⅦA | 0 | ||
2 | | | | ① | ② | | ③ | | ||
3 | | ④ | ⑤ | | | ⑥ | ⑦ | ⑧ | ||
4 | ⑨ | | | | | | ⑩ | |
| ⅠA | ⅡA | ⅢA | ⅣA | ⅤA | ⅥA | ⅦA | 0 | ||
2 | | | | C | N | | F | | ||
3 | | Mg | Al | | | S | Cl | Ar | ||
4 | K | | | | | | Br | |
A.131I和127I互为同位素 | B.131I和127I都含有53个中子 |
C.131I和127I分别含有78和74个质子 | D.131I和127I含有不同的电子数 |
A.Li | B.Na | C.Mg | D.Al |
族 周期 | IV | IIV | IIIV | IVA | VA | VIA | VIIA | O |
1 | A | | | | | | | |
2 | | | | D | E | | G | I |
3 | B | | C | | F | | H | |
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