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The simplest atom is that of hydrogen, the lightest element.
最简单的原子是重量最轻的氢元素的原子。
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Hydrogen, which is the lightest element, has only one electron.
最轻的元素氢只有一个电子。
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Hydrogen, which is the lightest element, has only one electron.
最轻的元素氢只有一个电子。
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