Atom structure and isotopes
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6 Terms
Atomic number
the number of protons in the nucleus of an atom of an element
Mass number
the sum of the number of protons and neutrons in the nucleus of an atom of an element
Isotopes
atoms of the same element that have the same number of protons with different numbers of neutrons
Relative isotopic mass
The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12
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
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
Note 
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