Anion

A negatively charged ion is called anion an - i - on . The negative charge is a result of gaining more electrons. See the example below for chlorine.

On the left, a chlorine atom labelled C l atom. The nucleus has 17 protons and 18 neutrons, and the atom contains 17 electrons. On the right, a chlorine ion labelled C l superscript negative ion. The nucleus contains 17 protons and 18 neutrons, and the atom contains 18 electrons. A box to right says 17 protons minus 18 electrons equals negative 1 charge overall.

Figure 1: A chlorine (Cl) atom has an equal number of protons and electrons (17) and is hence uncharged. In contrast, a chloride anion (Cl^-) has gained one electron. This results in more electrons than protons and gives Cl an overall negative charge of -1. The charge is indicated by a superscript.

Referred from:

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Ions

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Electrolytic conductivity