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  2. Calcium - Wikipedia

    en.wikipedia.org/wiki/Calcium

    Calcium is readily complexed by oxygen chelates such as EDTA and polyphosphates, which are useful in analytic chemistry and removing calcium ions from hard water. In the absence of steric hindrance , smaller group 2 cations tend to form stronger complexes, but when large polydentate macrocycles are involved the trend is reversed.

  3. Ionization energies of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Ionization_energies_of_the...

    For each atom, the column marked 1 is the first ionization energy to ionize the neutral atom, the column marked 2 is the second ionization energy to remove a second electron from the +1 ion, the column marked 3 is the third ionization energy to remove a third electron from the +2 ion, and so on.

  4. List of aqueous ions by element - Wikipedia

    en.wikipedia.org/wiki/List_of_aqueous_ions_by...

    Water molecules are omitted in this diagram. The model is defined in terms of a list of those complex species which are present in solutions in significant amounts. In the present context the complex species have the general formula [M p O q (OH) r] n±. where p, q and r define the stoichiometry of the species and n± gives the electrical ...

  5. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Starting the next row, for potassium and calcium the 4s subshell is the lowest in energy, and therefore they fill it. [39] [58] Potassium adds one electron to the 4s shell ([Ar] 4s 1), and calcium then completes it ([Ar] 4s 2). However, starting from scandium ([Ar] 3d 1 4s 2) the 3d subshell becomes the next highest in energy. The 4s and 3d ...

  6. Chemical element - Wikipedia

    en.wikipedia.org/wiki/Chemical_element

    Only the fraction of the mass and energy labeled "atoms" is composed of elements. Only about 4% of the total mass of the universe is made of atoms or ions , and thus represented by elements. This fraction is about 15% of the total matter, with the remainder of the matter (85%) being dark matter .

  7. Maucha diagram - Wikipedia

    en.wikipedia.org/wiki/Maucha_diagram

    A Maucha diagram, or Maucha symbol, is a graphical representation of the major cations and anions in a chemical sample. R. Maucha [1] published the symbol in 1932. [2] Maucha ionic diagram. It is mainly used by biologists and chemists for quickly recognising samples by their chemical composition. [3] [4] The symbol is similar in concept to the ...

  8. Calcium ion - Wikipedia

    en.wikipedia.org/?title=Calcium_ion&redirect=no

    From Wikipedia, the free encyclopedia. Redirect page

  9. Calcium channel - Wikipedia

    en.wikipedia.org/wiki/Calcium_channel

    A calcium channel is an ion channel which shows selective permeability to calcium ions. It is sometimes synonymous with voltage-gated calcium channel, [1] which are a type of calcium channel regulated by changes in membrane potential. Some calcium channels are regulated by the binding of a ligand.

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