What is the reason for stability of colloid?

What is the reason for stability of colloid?

The brownian movement of the colloidal particles help in giving the stability of the colloid. For this kind of motion, the particles move randomly and as a consequence the probability of the particles coming closer gets low and they can not conjugate. So the main reason for the stability of colloid is their electron charge. As for a definite colloid, same kind of charge exists in each particle, so a mutual repulsive force acts between them. As a result the particles can not conjugate and can't form big particles, so the colloid attain stability.

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