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2. Group (periodic table) - Wikipedia

   en.wikipedia.org/wiki/Group_(periodic_table)

   In the periodic table of the elements, each column is a group. In chemistry, a group (also known as a family) [1] is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.

3. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.

4. Alkali metal - Wikipedia

   en.wikipedia.org/wiki/Alkali_metal

   Periodic variation of Pauling electronegativities as one descends the main groups of the periodic table from the second to the sixth period. Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density ) towards itself. [ 101 ]

5. Sodium - Wikipedia

   en.wikipedia.org/wiki/Sodium

   Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23 Na. The free metal does not occur in nature and must be prepared from compounds. Sodium is the sixth most abundant element in the Earth's crust and exists in numerous minerals such as feldspars, sodalite, and halite (NaCl).

6. Main-group element - Wikipedia

   en.wikipedia.org/wiki/Main-group_element

   The periodic table of the chemical elements.The columns represent the groups.Groups 1, 2 and 13 to 18 constitute the main group. Sometimes groups 3 and 12, as well as the lanthanides and actinides (the two rows at the bottom), are also included in the main group.

7. History of the periodic table - Wikipedia

   en.wikipedia.org/wiki/History_of_the_periodic_table

   This is an accepted version of this page This is the latest accepted revision, reviewed on 17 November 2024. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and ...

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   www.aol.com/ssi-recipients-january-check...

   If you or someone you know thinks they may be eligible for SSI, you can begin the application process online, in person at your local Social Security office, or by calling 1-800-772-1213 (TTY 1 ...

9. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   The definitive visualisation of all 118 elements is the periodic table of the elements, ... f-block groups 7 f-block [251] 15.1: 1173 (1743) [b] – 1.3 – synthetic ...