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10 terms

Periodic Table elements 81-90

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Thallium 81
Tl
Lead 82
Pb
Bismuth 83
Bi
Polonium 84
Po
Astatine 85
At
Radon 86
Rn
Francium 87
Fr
Radium 88
Ra
Actinium 89
Ac
Thorium 90
Th