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.

Period one is much shorter than any other row in the table, and contains only two elements, hydrogen and helium. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the 1s orbital. Period 1 elements do not obey the "octet rule".

These are:

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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ar:عناصر الدورة الأولى ast:Elementos del periodu 1 ca:Elements del període 1 de:Periode-1-Element eo:Elemento de periodo 1 eu:1. periodoko elementu ko:1주기 원소 it:Elementi del periodo 1 lmo:Elemeent del períut 1 nl:Periode-1-element sk:1. perióda sr:1. периода хемијских елемената sv:Grundämnen i period 1 th:ธาตุคาบ 1



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