I need this as soon as possible! help :( You are conducting an experiment with Thallium which has two isotopes, Thallium- 203 and Thallium- 205. Thallium's atomic number is 81. The percent abundance of the two isotopes respectively, Thallium- 203; 35 % and Thallium- 205; 65%. Please calculate the average atomic mass of Thallium.

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