3. Atoms & Molecules
A negatively charged ion is known as anion. An anion is formed by the gain of one or more electrons by an atom.
Ex. A chlorine atom gains 1 electron to form a chloride ion, Cl–
, which is an anion.
An anion contains more electrons than a normal atom. A normal atom (or a neutral atom) contains an equal number of protons and electrons. Now, since an anion is formed by the addition of one or more electrons to an atom, therefore, an anion contains more electrons than protons. The ions of all the non metal elements are anions.
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