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Thallium consists of 29.5% TI-203 and 70.5% TI-205. Which is the relative atomic mass of thallium

User Peter Liaw
by
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1 Answer

3 votes
Relative atomic mass for two isotopes can be calculated as follows

Isotope atomic mass abundance
²⁰³Tl 203 29.5%
²⁰⁵Tl 205 70.5%

Relative atomic mass
= (mass of 1 isotope x % abundance) + (mass of 2 isotope x % abundance)
= (203 x
(29.5)/(100)) + (205 x
(70.5)/(100))
= 204.41 amu

Hence, relative atomic mass of Tl is 204.41amu
User Afterglowlee
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