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a very reactive atom or group of atoms with an unpaired valence electron.
polymerisation reaction that is started by a radical.
reactions in which bonds break to form products with unpaired electrons.
emitting (or giving off) radiation energy, which is harmful to living organisms.
when a nucleus is unstable and emits particles and energy.
(also called radioactive dating) a method of measuring the age of fossils based on how much...
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
discounted tariffs sometimes given to exporters in order to lower the costs of exported goods....
involving an equal likelihood that each outcome may occur.