A.①② | B.②③ | C.①③ | D.①②③ |
A | | | |||||
| | | | | D | E | |
B | | C | | | F | G | |
A.+3 | B.+4 | C.+5 | D.+6 |
A.硅 | B.碳 | C.铅 | D.氯 |
族 周期 | I A | Ⅱ A | Ⅲ A | Ⅳ A | Ⅴ A | Ⅵ A | Ⅶ A |
1 | A | | | | | | |
2 | | | | E | F | | |
3 | B | C | D | | G | H | I |
A.T2O与D2O | B.40 19K与4020Ca | C.O2和O3 | D.21H和31H |
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