Common · Knowledge
Period 8 element
Period 8 (row 8) of the periodic table. (Today, theoretically only)
Period
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Unbiennium
Hypothetical chemical element with the atomic number 129
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Group 12 element
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Untrinilium
Hypothetical chemical element with the atomic number 130
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Unbiseptium
Hypothetical chemical element with the atomic number 127
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Unbipentium
Hypothetical chemical element with the atomic number 125
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Untriennium
Hypothetical chemical element with the atomic number 139