质子带一个单位正电,电子带一个单位负电,而原子不带电,所以质子和电子的电抵消掉了,所以质子数等于电子数
质子带一个单位正电,电子带一个单位负电,而原子不带电,所以质子和电子的电抵消掉了,所以质子数等于电子数
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