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  2. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    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.

  3. Synthetic element - Wikipedia

    en.wikipedia.org/wiki/Synthetic_element

    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.

  4. List of elements by atomic properties - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by_atomic...

    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.

  5. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    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]

  6. National Register of Historic Places listings in Blair County ...

    en.wikipedia.org/wiki/National_Register_of...

    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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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Broad Avenue Historic District - Wikipedia

    en.wikipedia.org/wiki/Broad_Avenue_Historic_District

    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.

  9. Downtown Altoona Historic District - Wikipedia

    en.wikipedia.org/wiki/Downtown_Altoona_Historic...

    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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