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Period 1 element

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:

Chemical elements in the first period
e^--conf.
Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
# Name	1 H																	2 He

Alkali metals	Alkaline earths	Lanthanide	Actinides	Transition metals
Other metals	Metalloids	Nonmetals	Halogens	Noble gases

Period 1 element - Period 2 element - Period 3 element - Period 4 element - Period 5 element - Period 6 element - Period 7 element - Period 8 element[?]

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