We knew that the atom was electrically neutral.
原子是电中性的。
If an atom contains three protons, it must have three electrons to be electrically neutral.
如果一个原子含有三个质子，这个原子必然有三个电子，使之不带电荷。
In any atom, the number of protons is equal to the number of electrons, and hence it is electrically neutral.
任何原子的质子数量与电子数量相等，因此是电中性的。
In any atom, the number of protons is equal to the number of electrons, and hence it is electrically neutral.
任何原子的质子数量与电子数量相等，因此是电中性的。
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