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.
Here are some examples of the kinds of definitions you’ll find on this page.
molecule where the ratio of atoms is 1 : 3. So the bond angle is 1200, for example BF3
forms between two atoms if the two atoms share six electrons.
the part of the atmosphere that extends to a height of 10 km above the surface of the Earth.