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【题目】组成原子核的粒子是( )

A.带正电的质子和带负电的电子

B.带正电的质子和不带电的中子

C.带正电的质子、带负电的电子和不带电的中子

D.带负电的电子和不带电的中子

【答案】B

【解析】

试题分析:原子由带正电的原子核和核外带负电的电子构成,原子核是由带正电的质子和不带电的中子构成的.

解:在原子中心有个很小的核叫原子核,它由带正电的质子不带电的中子构成,故B正确.

故选B.

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