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ionization
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ionization

Process of ion formation. It can be achieved in two ways. The first way is by the loss or gain of electrons by atoms to form positive or negative ions.

Na - e− → Na+

1/2Cl2 + e− → Cl−

In the second mechanism, ions are formed when a covalent bond breaks, as when hydrogen chloride gas is dissolved in water. One portion of the molecule retains both electrons, forming a negative ion, and the other portion becomes positively charged. This bond-fission process is sometimes called dissociation.

HCl(g) + aq ⇌ H+(aq) + Cl−(aq)



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