Enter your answer in the provided box. An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 121.00 u and 123.00 u, with natural abundances of 90% and 10%, respectively.

Enter your answer in the provided box. An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 121.00 u and 123.00 u, with natural abundances of 90% and 10%, respectively. Calculate its average atomic mass. Report your answer to 2 decimal places.

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Enter your answer in the provided box. An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 121.00 u and 123.00 u, with natural abundances of …

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