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【简答题】
短周期的四种W、X、Y、Z，原子序数依次变小，四种的原子核外电子层数之和为8。X的原子最外层电子数等于Y和Z两的原子最外层电子数之和。W和Y的原子最外层上的电子数分别是各自电子层数的2倍。X和Z可以形成XZ 3 的化合物。 （1）写出名称：W__________，X____________，Y__________，Z__________。 （2）（XZ 4 ） 2 W属于离子化合物，写出此化合物的电子式_________________。 （3）A物质是一种酸，它的一个分子里含有一个W原子，一个X原子，一个Y原子和一个Z原子， A物质的钾盐溶液常用检验___________（填写一种阳离子符号）。 （4）已知W、X、Y、Z四种可两两组成多种气态分子，其中两种可相互反应，且因量的不同而产物也不同，请写出其不同反应的化学方程式：①__________________________； ②___________________________________________________________________________。 （5）已知W、X、Y、Z四种可两两组成多种微粒，请写出其中所含电子数相同的任意三种微粒______________________________________。
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