Answer:
Atoms
of different elements join together in definite proportions to form molecules
of compounds. For example, water, ammonia, carbon dioxide.
Compounds composed of metals and non-metals contain charged species. The charged
species are known as ions. An ion is a charged particle and can be negatively
or positively charged. A negatively charged ion is called an anion and the
positively charged ion is called cation. For example, sodium chloride, calcium
oxide.
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