What element has 81 protons in the nuclei of its atoms?
A. Thallium
B. Platinum
C. Uranium
D. Lead
Thallium has 81 protons in the nuclei of its atoms.
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alfred123|Points 127243|
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Asked 7/11/2018 7:24:21 PM
Updated 7/11/2018 7:45:12 PM
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jerry06 [7/11/2018 7:45:11 PM]
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