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8. The number of protons in the nucleus of an element is called its ____________________________ number.
9. If two or more compounds are composed of elements A and B, the ratio of the masses of B combined with 1 g of A is always a ratio of small whole numbers. This is a statement of the law of
____________________________.

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haneylia
8. The number of protons in the nucleus of an element is called its atomic number.

9. If two or more compounds are composed of elements A and B, the ratio of the masses of B combined with 1 g of A is always a ratio of small whole numbers. This is a statement of the law of definite proportions.

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