Elements isotopes and relative atomic mass

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4 Terms

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What is the definition of an isotope

Atoms of the same element with a different amount of neutrons

2
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What is the equation for relative atomic mass

Ar=

(Sum of isotope abundance x isotope mass )

sum of abundance of all isotopes

3
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How to work out mass number of an atom

Proton + neutron

4
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Uranium 235 has 92 protons, how many neutrons does it have

143