Chemistry question about Thallium please help?

Posted on 2014-12-15 07:11:00 in Chemistry by KAYLEE

Thallium has two isotopes, thallium -203 and thallium -205. Thallium's atomic number is 81, and its atomic mass is 204.38 amu.

Which statement about the thallium isotopes is true?

A) There is more thallium -203 in nature
B) Atoms of both isotopes have 81 protons
C) Thallium -205 atoms have fewer neutrons
D) The most common atom of Thallium has a mass of 204.38 amu

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