bn:01262870n
Noun Concept
Categories: Periods in the periodic table, All articles with unsourced statements
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period 1 element  period 1  Period 1 elements
EN
A period 1 element is one of the chemical elements in the first row of the periodic table of the chemical elements. Wikipedia
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EN
A period 1 element is one of the chemical elements in the first row of the periodic table of the chemical elements. Wikipedia
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