1、元素，element，是具有相同質子數但不同中子數的原子的通稱、總稱，也可以說。(General name for atoms with same number of protons and different numbers of neutrons)。
2、元素，element，是具有相同電子數的中性原子 neutral atom 的通稱、總稱。(General name for atoms in neutral state with same number of electrons as protons)
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