试题与答案

下列有关物质性质的比较正确的是( ) A.同主族元素的单质从上到下,非金属性减弱

题型:选择题

题目:

下列有关物质性质的比较正确的是(  )

A.同主族元素的单质从上到下,非金属性减弱,熔点增高

B.主族元素正化合价数,等于它的族序数

C.元素的非金属性越强,它的气态氢化物水溶液的酸性越强

D.酸性:HClO4>H2SO4>H3PO4>H2SiO3

答案:

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