Period 1 element
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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. |