Atomic number, atomic mass, mass number

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4 Terms

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What is the mass number?

Number of protons and neutrons - mass of one sample of the element

2
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What is the atomic mass?

the average mass of all the element in the world - found on the periodic table under the symbol (decimals matter even if its zero)

3
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What is an atomic number?

the number of protons in the nucleus of an atom

4
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