Why can Earth have H2O in all three states of matter: solid, liquid and gas. But Mars and Venus cannot, explain:

Their atmospheres are too gaseous to turn water into a solid

Explanation:

If you study the planets, questions like these just become common sense to you

because of

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.