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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    This can hold up to two electrons. The second shell similarly contains a 2s orbital, and it also contains three dumbbell-shaped 2p orbitals, and can thus fill up to eight electrons (2×1 + 2×3 = 8). The third shell contains one 3s orbital, three 3p orbitals, and five 3d orbitals, and thus has a capacity of 2×1 + 2×3 + 2×5 = 18.

  3. 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).

  4. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    The configurations of the elements in this table are written starting with [Og] because oganesson is expected to be the last prior element with a closed-shell (inert gas) configuration, 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 5f 14 6s 2 6p 6 6d 10 7s 2 7p 6. Similarly, the [172] in the configurations for elements ...

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  6. Help : Periodic table classifications in the English Wikipedia

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

    IUPAC had previously supported this format of group 3 in a 1988 report as well, and it shows that when displaying 32-column tables (then ambiguity is impossible). Three formats of group 3 are common: one has Lu and Lr below Y (like the 1988 and 2021 IUPAC reports), one has La and Ac under Y, and one has blank spaces under Y.

  7. Period (periodic table) - Wikipedia

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

    From left to right, aqueous solutions of: Co(NO 3) 2 (red); K 2 Cr 2 O 7 (orange); K 2 CrO 4 (yellow); NiCl 2 (green); CuSO 4 (blue); KMnO 4 (purple). Period 4 includes the biologically essential elements potassium and calcium , and is the first period in the d-block with the lighter transition metals .

  8. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    0–0 British English: nil-nil or nil all; American English: zero-zero or nothing-nothing, (occasionally scoreless or no score) 22 two-two or two all; American English also twos, two to two, even at two, or two up. Naming conventions of Tennis scores (and related sports) are different from other sports.

  9. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5. As you would start on the number you are multiplying, when you multiply by 0, you stay on 0 (0 is external and so the arrows have no effect on 0, otherwise 0 is used as a link to create a perpetual cycle).

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