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Abundance of isotopes question. HELP PLEASE?

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Thallium-203 and Thallium-205 are two stable isotopes of Thallium. The atomic weight of Thallium is 204.4, knowing this which isotope is more abundant?

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  1. There is more 205.

    Were there equal amounts, the number would be 204.

    The number is going to be 203 + 2*fraction of 205

    So I get that it is 70% 205.

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