Explain thallium has an average atomic mass

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Thallium has an average atomic mass of 204.3833 u. It has two naturally occuring isotopes, 203Tl (with a mass of 202.9723 u) and 205Tl (with a mass of 204.9745 u). Find the percent abundance of the two isotopes, to ±0.001%.

Reference no: EM13282908

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