Atom structure and isotopes

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6 Terms

1
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Atomic number

the number of protons in the nucleus of an atom of an element

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Mass number

the sum of the number of protons and neutrons in the nucleus of an atom of an element

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Isotopes

atoms of the same element that have the same number of protons with different numbers of neutrons 

4
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Relative isotopic mass 

The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12

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Relative atomic mass

The weighted mean mass of an atom of an atom of an element compared with 1/12th of the mass of an atom of carbon-12

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Relative formula mass

the weighted mean mass of the formula unit of a compound compared with 1/12th of the mass of an atom of carbon-12