The element thallium (Tl) has two naturally occurring isotopes, 203 T1 and 205 T1, with an average atomic mass of 204.383 u.

Question

The element thallium (Tl) has two naturally occurring isotopes, 203 T1 and 205 T1, with an average atomic mass of 204.383 u. Thallium is 70.48% 205 Tl, and the atomic mass of 205 Tl is 204.974 u. Calculate the atomic mass of 203 Tl.
u

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