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An extended periodic table theorizes about chemical elements beyond those currently known and proven. The element with the highest atomic number known is oganesson (Z = 118), which completes the seventh period (row) in the periodic table. All elements in the eighth period and beyond thus remain purely hypothetical.
The synthetic elements are those with atomic numbers 95–118, as shown in purple on the accompanying periodic table: [1] these 24 elements were first created between 1944 and 2010. The mechanism for the creation of a synthetic element is to force additional protons into the nucleus of an element with an atomic number lower than 95.
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [1]
Location of Blair County in Pennsylvania. This is a list of the National Register of Historic Places listings in Blair County, Pennsylvania.. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Blair County, Pennsylvania, United States.
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Broad Avenue Historic District is a national historic district located at Altoona, Blair County, Pennsylvania. The district includes 140 contributing buildings in a residential area of Altoona. The buildings were primarily built between 1880 and 1927, and reflect a number of popular architectural styles including Colonial Revival and Italianate.
HABS No. PA-5505, "U.S. Post Office, 1201 Eleventh Avenue, Altoona, Blair County, PA", 6 photos, 7 data pages, 1 photo caption page HABS No. PA-5513, " First Evangelical Lutheran Church, 1401-1405 Twelfth Avenue, Altoona, Blair County, PA ", 9 photos, 6 data pages, 1 photo caption page
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