elements, isotopes + relative atomic mass

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5 Terms

1
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what is an element

an element is a pure substance consisting of only one type of atom which is the number of protons

2
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how many different elements are there

100

3
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what is an isotope

a variant of an element that has the same number of protons but a different number of neutrons

4
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what does relative atomic mass mean

the average mass of an element's isotopes, taking into account the abundance and mass number of each isotope

5
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what is the formula for relative atomic mass

the sum of the masses of each isotope multiplied by their %, divided by the total %