The element thallium is 70% thallium-205 and 30% thallium-203. Calculate its relative atomic mass to 1 decimal place.
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Answer: 204.4
Explanation: weighted average of the atomic mass of both the isotopes I.e. 70% of 205 + 30% of 203 = (7 x 205 + 3 x 203) / 10 = (1435 + 609) / 10 = 2044/10 = 204.4
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Thallium occurs naturally and is found in two isotopes that are very stable.
TL 203 has an atomic mass of 203 and is 30%, and TL 205 has an atomic mass of 205 and is 70%.
Therefore (70/100) X 205 + (30/100) x 203 = x = Relative atomic mass of Thallium.
Therefore the relative atomic mass of thallium from the above expression is 143.5 + 60.9 = 204.4.
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