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A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the elements.
These are:
| Group | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| # Name | 1 H | 2 He | ||||||||||||||||
| e--conf. | ||||||||||||||||||
Period 1 element -
Period 2 element -
Period 3 element -
Period 4 element -
Period 5 element -
Period 6 element -
Period 7 element -
Period 8 element
عناصر الدورة الأولى | Elementos del periodu 1 | Elements del període 1 | Periode-1-Element | Elementos del periodo 1 | Elemento de periodo 1 | 1. periodoko elementu | Éléments de la période 1 | Elementi del periodo 1 | Periode-1-element | 第1周期元素 | Grundämnen i period 1 | ธาตุคาบ 1 | 1. periyot elementleri | 第1周期元素
"Period 1 element"