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What is an ion ?
An ion is an atom or molecule having net electrical charge.
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How ions are formed?
Ions are formed by the removal or addition of electron/s from a neutral atom.
Types of Ions:
There are two types of ions.
1.Positively Charged ion (Cation)
2.Negatively Charged ion (Anion)
Difference Between Cation & Anion:
1.Cations are positively charged ion e.g. H+ , Na+ , Ca+2 etc.
2.Cations are formed by the lose of electron/s.
e.g. when Na atom loses one electron ,results in the formation of Na+ ion.
3.Cations contain more protons than electrons .Therefore , the size of cation is smaller the the corresponding neutral atom.
4.Cations are usually formed from metals.
1.Anions are negatively charged ions .e.g. OH- ,Cl- , I- etc.
2.Anions are formed by the gain of electron/s e.g. Cl atom after the gain of one electron form chloride ion(Cl-).
3.Anions contain more electrons than protons. Therefore, the size of anion is bigger than the corresponding atom.
4.Anions are usually formed from non-metal.