Main Page | See live article | Alphabetical index 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 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 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 This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.