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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Boron (1s 2 2s 2 2p 1) puts its new electron in a 2p orbital; carbon (1s 2 2s 2 2p 2) fills a second 2p orbital; and with nitrogen (1s 2 2s 2 2p 3) all three 2p orbitals become singly occupied. This is consistent with Hund's rule , which states that atoms usually prefer to singly occupy each orbital of the same type before filling them with the ...

  3. Periodic table (electron configurations) - Wikipedia

    en.wikipedia.org/wiki/Periodic_table_(electron...

    Og, 118, oganesson : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 2 5f 14 6d 10 7p 6 Note that these electron configurations are given for neutral atoms in the gas phase, which are not the same as the electron configurations for the same atoms in chemical environments.

  4. 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.

  5. Help : Periodic table classifications in the English Wikipedia

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

    This happens to fill the whole periodic table in 7 rows (periods). Heavier elements (atomic number 119 and higher) are theoretically described, and start in period 8 (row 8). When these undiscovered elements are placed in the periodic table, it is called an extended periodic table.

  6. Portal:Chemistry/Elements/Periodic Table - Wikipedia

    en.wikipedia.org/.../Elements/Periodic_Table

    1. Hydro­gen 1 H 1.0080: He­lium 2 He 4.0026: 2: Lith­ium 3 Li 6.94: Beryl­lium 4 Be 9.0122: Boron 5 B 10.81: Carbon 6 C 12.011: Nitro­gen 7 N 14.007: Oxy­gen 8 O 15.999: Fluor­ine 9 F 18.998: Neon 10 Ne 20.180: 3: So­dium 11 Na 22.990: Magne­sium 12 Mg 24.305: Alumin­ium 13 Al 26.982: Sili­con 14 Si 28.085: Phos­phorus 15 P 30.974 ...

  7. This 12-year-old memorized the periodic table at age 2. He’s ...

    www.aol.com/12-old-memorized-periodic-table...

    The gifted tween, who memorized the periodic table at 2 years old and has taught lectures at colleges in India since he was 7, graduated on Wednesday from Malverne High School in Nassau County ...

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

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

    [5] [6] [7] Some sources follow a compromise that puts La–Lu and Ac–Lr as the f-block rows (despite that giving 15 f-block elements in each row, which contradicts quantum mechanics), leaving the heavier members of group 3 ambiguous. [2] See also Group 3 element#Composition. d Group 18, the noble gases, were not discovered at the time of ...

  9. IUPAC Inorganic Chemistry Division - Wikipedia

    en.wikipedia.org/wiki/IUPAC_Inorganic_Chemistry...

    The Inorganic Chemistry Division of the International Union of Pure and Applied Chemistry (IUPAC), also known as Division II, [1] deals with all aspects of inorganic chemistry, including materials and bioinorganic chemistry, and also with isotopes, atomic weights and the periodic table.

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