题目列表(包括答案和解析)
某金属元素R的硫化物的化学式为RS,其式量与相同价态氧化物的式量之比为9:7,则R的相对原子质量是()
A.40 B.56 C.64 D.24
1H +1 | 2He 0 | ||||||
3Li +1 | 4Be +2 | 5B +3 | 6C +4,-4 | 7N +5,-3 | 8O -2 | 9F -1 | 10Ne 0 |
11Na +1 | 12Mg +2 | 13Al +3 | 14Si +4,-4 | 15P +5,-3 | 16S | 17Cl +7,-1 | 18Ar 0 |
1H +1 | 2He | ||||||
3Li +1 | 4Be +2 | 5B +3 | 6C +4,-4 | 7N +5,-3 | 8O -2 | 9F -1 | 10Ne |
11Na +1 | 12Mg +2 | 13Al +3 | 14Si +4,-4 | 15P +5,-3 | 16S | 17Cl +7,-1 | 18Ar |
1H +1 |
2He 0 | ||||||
3Li +1 |
4Be +2 |
5B +3 |
6C +4,-4 |
7N +5,-3 |
8O -2 |
9F -1 |
10Ne 0 |
11Na +1 |
12Mg +2 |
13Al +3 |
14Si +4,-4 |
15P +5,-3 |
16S | 17Cl +7,-1 |
18Ar 0 |
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