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:\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

Chemical elements in the first period

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

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

\nPeriod 1 element -\nPeriod 2 element -\nPeriod 3 element -\nPeriod 4 element -\nPeriod 5 element -\nPeriod 6 element -\nPeriod 7 element -\nPeriod 8 element\n