Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H2, sometimes …

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H是 元素符号，表示 氢元素，还表示一个 氢原子 ． 2H是元素符号前带有数字的符号，只表示2个氢原子． H2是化学式，表示氢气，表示氢气由氢元素组成，表示氢气由氢分子构成，表示1个 …

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