Relative Atomic Mass and Isotopic Mass

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4 Terms

1
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What's the relative atomic mass?

The weighted mean mass of an atom of an element, compared to 1/12 of the mass of an atom of carbon-12

2
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Why is the relative atomic mass not usually a whole number?

It's an average

3
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What is the relative isotopic mass?

The mass of an atom of an isotope of an element compared to 1/12 of the mass of carbon-12

4
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What is the relative isotopic mass usually as a number?

Rounded to a whole number