enow.com Web Search

Search results

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

    en.wikipedia.org/wiki/Alkali_metal

    Hydrogen, like the alkali metals, has one valence electron [122] and reacts easily with the halogens, [122] but the similarities mostly end there because of the small size of a bare proton H + compared to the alkali metal cations. [122] Its placement above lithium is primarily due to its electron configuration. [157]

  3. Group (periodic table) - Wikipedia

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

    a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional.

  4. Chemistry: A Volatile History - Wikipedia

    en.wikipedia.org/wiki/Chemistry:_A_Volatile_History

    One such pattern hunter was German chemist Johann Döbereiner. He believed the key to understanding the elements lay not with their atomic weights but with their chemical properties. He noticed that one could often single out three elements that exhibited similar properties, such as the alkali metals, which he called triads.

  5. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional.

  6. Period 1 element - Wikipedia

    en.wikipedia.org/wiki/Period_1_element

    A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate periodic (recurring) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that analog elements fall into the same ...

  7. Naming of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Naming_of_chemical_elements

    alkali metals Alkaline earth metals Triels Tetrels Pnicto­gens Chal­co­gens Halo­gens Noble gases Period. 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 ...

  8. Water-reactive substances - Wikipedia

    en.wikipedia.org/wiki/Water-reactive_substances

    Notable examples include alkali metals, lithium through caesium, and alkaline earth metals, magnesium through barium. Some water-reactive substances are also pyrophoric, like organometallics and sulfuric acid. The use of acid-resistant gloves and face shield is recommended for safe handling; fume hoods are another effective control of such ...

  9. Alkalide - Wikipedia

    en.wikipedia.org/wiki/Alkalide

    An alkalide is a chemical compound in which alkali metal atoms are anions (negative ions) with a charge or oxidation state of −1. Until the first discovery of alkalides in the 1970s, [1] [2] [3] alkali metals were known to appear in salts only as cations (positive ions) with a charge or oxidation state of +1. [4]