T1 - Isotopes and Ar

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Chemistry

GCSE Chemistry

Edexcel

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5 Terms

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Isotopes

  • Different forms of the same element, which have the same number of protons but a different number of neutrons

  • so isotopes have the same atomic number, but different mass numbers

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Relative Atomic Mass (Ar)

the average mass of one atom of the element, compared to 1/12 of the mass of one atom of carbon-12

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Formula to calculate the Ar of an element from its isotopic abundance

Ar = sum of (isotopic abundance x isotope mass number)/ sum of abundances of all the isotopes x 100

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are isotopes stupid?

yes

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