What is a diffusion, suspension, and colloid?

1) the spreading of something more widely.

2) the temporary prevention of something from continuing or being in force or effect.

3) a homogeneous noncrystalline substance consisting of large molecules or ultra-microscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.

Explanation:

Colloidal suspensions are dispersions of small particles, ranging in size from 1 nanometer to 1 micrometer, in a solvent. ... This action prevents the colloid particles from settling out of the solvent. More importantly, Brownian motion contributes to the diffusion of colloid particles through the solution.

the answer for sodium is 0.186

the answer for rubidium is 0.251