A-A+
Which of the following is true within an atom
问题详情
Which of the following is true within an atom according to the passage?
A.The charges of protons equal the charges of electrons.
B.The charges of neutrons equal the sum of the charges of electrons and protons.
C.The charges of protons equal the sum of the charges of electrons and neutrons.
D.The charges of electrons equal the sum of the charges of protons and neutrons.请帮忙给出正确答案和分析,谢谢!
参考答案
正确答案:B
解析:本题问“根据本文下列哪一个对原予内情况的说法是正确的?”文章第一段第三、四、五句介绍原子内的电荷组成,“质子和电子都带电荷。但它们所带电荷正好相反,质子带正电荷,电子带负电荷,而中子不带电”,即质子和电子的电荷数相加为零,等于中子电荷数,故[B]“中子的带电荷数等于质子和电子电荷之和”正确。[A]“质子的带电荷敷等于电子带电荷敷”。质子与电子所带电荷相反,所以不能相等。[C]“质子的带电荷敷等于电子和中子电荷之和”。质子与电子所带电荷相反,中子带电为零,所以不能相等。[D]“电子的带电荷敷等于质于和中子电荷之和”。电子与质子所带电荷相反,中子带电为零,所以不能相等。