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The INTERNET Database of Periodic Tables


There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.

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2004

Elemental Hydride Types Periodic Table

  • Ionic or Salt-Like Hydrides: Molten LiH conducts electricity and hydrogen gas is liberated at the anode confirming presence of hydride ion H. The crystal structures show an ionic lattice, and not an LiH molecular lattice.
  • Covalent Hydrides are formed by the p-Bolock elements.
  • Metallic or Interstitial Hydrides are formed by many d-block and f-block elements when heated with hydrogen under pressure. The hydrides tend to be non-stoichiometric and they may be of variable composition.
  • There is a Hydride Gap where elements do not form hydrides. This roughly maps to the Siderophile Elements of the geologist's periodic table (below).
  • The Intermediate Hydrides do not fit: beryllium hydride is polymeric, (BeH2)n. Others have properties between metallic and covalent.

The main group elemental hydrides are all well known reagent chemicals. The main group hydrides always give the lowest and most common oxidation state, and all chemicals are molecular in the gas phase. The Group I and II hydrides are ionic materials, but they can be vaporised to give the molecular form.

The chemicals present and behave as Lewis acids, Lewis bases or Lewis acid/base complexes, here:

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pre 1900 formulations 1900 to 1949 formulations 1950 to 1999 formulations 2000 to 2009 formulations Spiral formulations 3 dimensional formulations
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Periodic Table, What is it showing?
Binary Compounds

© Mark R. Leach 1999-


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