Glossary

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Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

  • First click on the letters of the alphabet to browse for terms.
  • Select a subject from the drop-down menu above to filter the terms by Subject.
  • Or lastly, type the term you are looking for into the search box.

EXAMPLES

Here are some examples of the kinds of definitions you’ll find on this page.

a single electron in an orbital of an atom.

when an organic compound contains a double or triple bond and thus the maximum number of...

a white crystalline organic compound used as a fertilizer, in medicine and in resins.

the electrons in the outermost occupied shell of an atom.

the energy level, or shell, of an atom that contains the valence electrons.

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