X、Y均为周期表中短周期元素,X原子的核外电子数是Y原子的核外电

X、Y均为周期表中短周期元素,X原子的核外电子数是Y原子的核外电子数的6倍,它们彼此间可形成多种稳定的化合物,下列说法正确的是(    )

A.X、Y形成的化合物的分子式可能为X4Y4

B.X原子的相对原子质量是Y原子的相对原子质量的6倍

C.X可能在第三周期,Y可能在第二周期

D.X、Y形成的化合物可能使溴水褪色

答案

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解析:X、Y分别为C、H两种元素。它们组成的化合物如CH≡C—CH=CH2,既符合分子式C4H4,又能使溴水褪色。

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