Samples of neon gas and of krypton gas, with identical numbers of moles, pressures and volumes, are also held at the same temperature. What can be said of the particles of neon gas when compared to the particles of krypton gas?

the neon gas will possess a greater kinetic energy

Explanation:

The neon gas is smaller in mass than the krypton gas. At the came temperature and pressure, the has with a lesser mass will have greater kinetic energy and move faster than the gas with a greater mass. This follows from Graham's law of diffusion in gasses.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6