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2. 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.

3. Block (periodic table) - Wikipedia

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

   The f-block, with the f standing for "fundamental" and azimuthal quantum number 3, appears as a footnote in a standard 18-column table but is located at the center-left of a 32-column full-width table, between groups 2 and 3. Periods from the sixth onwards have a place for fourteen f-block elements.

4. Template:List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Template:List_of_chemical...

   Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... List of chemical elements/2020}}-- compare OLD and NEW table (1 July 2021): ...

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).

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7. Template:List of oxidation states of the elements - Wikipedia

   en.wikipedia.org/wiki/Template:List_of_oxidation...

   Download as PDF; Printable version; ... not pure elements in their standard state or allotropes. ... F −1: 17 10 neon: Ne 0 18 0 [11] 11 sodium: Na