A.136 | B.50 | C.86 | D.222 |
A.m – 13 = n | B.n + 5 = m | C.m + 8 = n | D.n – 11 =" m" |
A.其最高化合价为+3 | B.可以形成化学式为KXO3的盐 |
C.其氢化物可以用来做喷泉实验 | D.其最高价氧化物的水化物是强酸 |
A.6 | B.12 | C.26 | D.30 |
A.酸性:H2SO4>HClO4>HBrO4 | B.碱性:NaOH>KOH>RbOH |
C.非金属性: P>S>Cl | D.气态氢化物稳定性:HF>H2O>PH3 |
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