The dispersed particles of a colloid exhibit brownian motion, in which they move toward one another, forming tiny clumps, or aggregates slowly across a circular path through the dispersion medium rapidly across a circular path through the dispersion medium in a chaotic manner without a discernible pattern

in a chaotic manner without a discernible pattern (gradpoint)

Explanation:

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.