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.

the mass of a formula unit relative to one atomic mass unit.

the sum of the atomic masses of the atoms in a molecule.

the reaction that uses up products and forms reactants.

reactions that either simultaneously occur in both directions or that can be reversed by...

Ernest Rutherford carried out the famous experiment that led to the hypothesis of the nuclear...

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