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centre part of an atom with positive charge concentrated in a tiny kernel.
organisms that use dead organic material as a food source and thus recycles them.
a group of organic compounds that can be represented by a general formula e.g. alkanes, alcohols...
a property that, if changed, can change the chemical nature of a substance and how it reacts....
the SI unit of amount of substance. 1 mole contains the same number of particles as there are in...