Helium atom would have the highest kinetic energy.
What is Kinetic Energy ?
Kinetic energy is a form of energy that a gas has by reason of its motion.
If work, which transfers energy, is done on a gas by applying a net force, the gas speeds up and thereby gains kinetic energy
Different gas particles move at different speeds with there definite kinetic energy—gases with smaller particles tend to be moving faster at the same temperature, which means they have a higher speed.
Helium is the smallest particles and thus, it will be the gas with the highest speed.
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