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EXPLAIN why particles of colloidal solution do not settle down when kept undisturbed whereas particles of suspension do settle down?

The size of the colloidal particles though is bigger than particles of true solutions, but is smaller than the size of suspension.  We know that the particles in a colloid show continuous random zigzag motion called  brownian motion. This brownian motion counters the force of gravity acting on colloidal particles and helps in providing stability to colloidal sols by not allowing them to settle. The fact that colloidal particles are charged and repel each other also contributes to colloidal particles not settling down, even after being left undisturbed for a long time. 

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this is because a colloidal solution is stable while suspension is not

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 The particles of A COLLOID may be bigger than a true solution but these particles are smaller than a suspension

the particles of a colloid are small and light therefore this solution is stable so the  particles of the solution does not settle down.

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