A group of atoms that react as a single unit
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A molecule is two or more atoms chemically joined together. If at least two different elements make up the molecule, it is called a compound. For example, hydrogen gas (H2) and water (H2O) are molecules, but water is also a compound because it is made up of hydrogen and oxygen.
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it is called a complex.
hope u satisfied with my answer
kishamuthoni:
the answer is a radical for example a sulphate is a radical and it is composed of sulphur and oxygen(SO4) with an ionisation energy of -2 but still reacts as a single unit. Other radicals include nitrates,nitrites,any radical attached to a hydrogen ion and the ammonium ion in valency 1, sulphites and carbonates in valency 2 and phosphates in valency 3
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