enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Calcium - Wikipedia

    en.wikipedia.org/wiki/Calcium

    Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal , calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium .

  3. Chemical symbol - Wikipedia

    en.wikipedia.org/wiki/Chemical_symbol

    Chemical symbols are the abbreviations used in chemistry, ... The symbols for magnesium and calcium ("lime") were replaced by 1808, and that for gold was simplified.

  4. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    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). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...

  5. Calcium oxide - Wikipedia

    en.wikipedia.org/wiki/Calcium_oxide

    Calcium oxide (formula: Ca O), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic , alkaline , crystalline solid at room temperature . The broadly used term lime connotes calcium-containing inorganic compounds , in which carbonates , oxides , and hydroxides of calcium, silicon , magnesium ...

  6. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. [6]

  7. Standard atomic weight - Wikipedia

    en.wikipedia.org/wiki/Standard_atomic_weight

    Symbol A r is a relative atomic mass, for example from a specific sample. To be specific, the standard atomic weight can be noted as A r °(E) ... calcium: 20 Ca

  8. Naming of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Naming_of_chemical_elements

    While the symbol is often a contraction of the element's name, it may sometimes not match the element's English name; for example, "Pb" for lead (from Latin plumbum) or "W" for tungsten (from German Wolfram). Elements which have only temporary systematic names are given temporary three-letter symbols (e.g. Uue for ununennium, the undiscovered ...

  9. Calcium carbide - Wikipedia

    en.wikipedia.org/wiki/Calcium_carbide

    Calcium carbide, also known as calcium acetylide, is a chemical compound with the chemical formula of Ca C 2. Its main use industrially is in the production of acetylene and calcium cyanamide . [ 3 ]