一种元素的原子可以互相化合，也可以与别的元素的原子化合，这种能力取决于其原子序数。
The ability of the atoms of an element to combine with one another or with the atoms of other elements depends on its atomic number.
一种元素的原子序数是其原子核中的质子数。
An element's atomic number is the number of protons in its nucleus.
一种元素的原子序数是其原子核中的质子数。
An element's atomic number is the number of protons in its nucleus.
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