Ir is made of gaseous elements and compounds that interact but are not bound to each other. so air can be considered a a) colloid b) mixture c) compound d) suspension

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.