下列有关分子、原子和离子的说法正确的是 A.分子是保持物质性质

下列有关分子、原子和离子的说法正确的是

A.分子是保持物质性质的最小粒子

B.分子、原子、离子都可以直接构成物质

C.在化学反应中,分子不能再分

D.物体有热胀冷缩现象,主要是因为物体中的粒子大小随温度的改变而改变

答案

B

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