试题与答案

下列说法正确的是( ) A.23g金属钠变为钠离子时得到的电子数为NA B.24

题型:选择题

题目:

下列说法正确的是(  )

A.23g金属钠变为钠离子时得到的电子数为NA

B.24g镁原子的最外层电子数为NA

C.在标准状况下,1 mol H2和1mol H2O所占的体积都约是22.4L

D.在标准状况下,22.4L由N2和N2O组成的混合气体中,所含有的氮原子的物质的量2mol

答案:

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