- Physical Sciences
a very small, negatively charged particle that moves around the nucleus of an atom.
substances such as elements or compounds, that cannot be broken down into simpler substances by...
the elimination of a hydrogen halide, such as hydrogen bromide, from a halo-alkane.
a measure of the amount of substance per unit volume. Unit: mol.dm-3
a solution to which a little base has been added to a lot of water.