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Period 1 element
Additional recommended knowledge
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".
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Period_1_element". A list of authors is available in Wikipedia.|