Which substance is most likely to be solid at room temperature? Neon, Ne a polar molecule that is 32 g/mole a polar molecule that is 186 g/mole a nonpolar molecule that is 32 g/mole Solution Neon is a noble gas. Matter in solid state has more interatomic forces of attraction and high density. The polar molecule contain more interatomic forces of attraction,hence it will be solid.Also, density is directly proportional to the mass.Thus,polar molecule with higher mass will be the solid at room temperature.So,the correct answer is: polar molecule that is 186g/mole. .