bn:01262891n
Noun Concept
Categories: Periods in the periodic table
EN
period 7  period 7 element  period 7 elements
EN
A period 7 element is one of the chemical elements in the seventh row of the periodic table of the chemical elements. Wikipedia
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EN
A period 7 element is one of the chemical elements in the seventh row of the periodic table of the chemical elements. Wikipedia
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