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  2. Main-group element - Wikipedia

    en.wikipedia.org/wiki/Main-group_element

    The main group includes the elements (except hydrogen, which is sometimes not included [citation needed]) in groups 1 and 2 , and groups 13 to 18 . The s-block elements are primarily characterised by one main oxidation state, and the p-block elements, when they have multiple oxidation states, often have common oxidation states separated by two ...

  3. Group (periodic table) - Wikipedia

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

    Therefore, it is located in group 1. Calcium (Ca) is in group 2, for it contains two valence electrons. In the old IUPAC system the letters A and B were designated to the left (A) and right (B) part of the table, while in the CAS system the letters A and B are designated to main group elements (A) and transition elements (B). The old IUPAC ...

  4. Template:Periodic table (group names) - Wikipedia

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

    a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional.

  5. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. ... [66] [67] and finally six main ...

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  7. Names for sets of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Names_for_sets_of_chemical...

    The metals of group 1: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: The metals of group 2: Be, Mg, Ca, Sr, Ba, Ra Transition elements * Elements in groups 3 to 11 or 3 to 12 (the latter making up the d-block) Pnictogens: The elements of group 15: N, P, As, Sb, Bi † Chalcogens: The elements of group 16: O, S, Se, Te, Po † Halogens

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  9. Group One - Wikipedia

    en.wikipedia.org/wiki/Group_One

    Group One, Group 1, Grade I or G1 is the term used for the highest level of Thoroughbred and Standardbred stakes races in many countries. In Europe, the level of races for Thoroughbred racing is determined using the Pattern race system introduced in 1971 and monitored by the European Pattern Committee.