1. Consider these atoms: helium, He; chlorine, Cl; and argon, Ar. Rank them by their atomic number, from smallest to largest. 2. Consider three 1-gram samples of matter: (a) carbon-12, (b) carbon-13,...

1. Consider these atoms: helium, He; chlorine, Cl; and argon, Ar. Rank them by their atomic number, from smallest to largest.

2. Consider three 1-gram samples of matter: (a) carbon-12, (b) carbon-13, (c) uranium-238. Rank the samples by the number of atoms in each, from most to least.