Naturally occurring thallium consists of two stable isotopes, Tl-203 and Tl-205 (atomic masses = 203 — Atomic Structure Chemistry Question
Question
Naturally occurring thallium consists of two stable isotopes, Tl-203 and Tl-205 (atomic masses = 203.0 and 205.0, respectively) and has an average atomic mass of 204.4. What is the percentage of Tl-205?
A.
14.0%
B.
30.0%
C.
50.0 %
D.✓ Correct
70.0 %
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