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  2. Charge number - Wikipedia

    en.wikipedia.org/wiki/Charge_number

    A chemical charge can be found by using the periodic table. An element's placement on the periodic table indicates whether its chemical charge is negative or positive. Looking at the table, one can see that the positive charges are on the left side of the table and the negative charges are on the right side of the table.

  3. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The periodic table is a graphic description of the periodic law, [36] ... [50] and the order can shift slightly with atomic number [51] and atomic charge. [52] [h]

  4. Effective nuclear charge - Wikipedia

    en.wikipedia.org/wiki/Effective_nuclear_charge

    The nuclear charge; oxidation number; The screening effect of the inner shells; The extent to which the outermost electron penetrates into the charge cloud set up by the inner lying electron; In the periodic table, effective nuclear charge decreases down a group and increases left to right across a period.

  5. Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number

    Nevertheless, in spite of Rutherford's estimation that gold had a central charge of about 100 (but was element Z = 79 on the periodic table), a month after Rutherford's paper appeared, Antonius van den Broek first formally suggested that the central charge and number of electrons in an atom were exactly equal to its place in the periodic table ...

  6. Periodic trends - Wikipedia

    en.wikipedia.org/wiki/Periodic_trends

    Major periodic trends include atomic radius, ionization energy, electron affinity, electronegativity, nucleophilicity, electrophilicity, valency, nuclear charge, and metallic character. [1] Mendeleev built the foundation of the periodic table. [2]

  7. Ion - Wikipedia

    en.wikipedia.org/wiki/Ion

    On the other side of the periodic table, chlorine has seven valence electrons, so in ionized form it is commonly found with one gained electron, as Cl −. Caesium has the lowest measured ionization energy of all the elements and helium has the greatest. [19]

  8. Alkaline earth metal - Wikipedia

    en.wikipedia.org/wiki/Alkaline_earth_metal

    The alkaline earth metals have the second-lowest first ionization energies in their respective periods of the periodic table [4] because of their somewhat low effective nuclear charges and the ability to attain a full outer shell configuration by losing just two electrons. The second ionization energy of all of the alkaline metals is also ...

  9. Tennessine - Wikipedia

    en.wikipedia.org/wiki/Tennessine

    In the periodic table, tennessine is expected to be a member of group 17, ... the positive value implying that the negative charge is on the tennessine atom.

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