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Level 9

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Atomic Number 81
Thallium
Atomic Number 82
Lead
Atomic Number 83
Bismuth
Atomic Number 84
Polonium
Atomic Number 85
Astatine
Atomic Number 86
Radon
Atomic Number 87
Francium
Atomic Number 88
Radium
Atomic Number 89
Actinium
Atomic Number 90
Thorium