Argon and Xenon are both gases that are found in the Earth's atmosphere. Argon is a noble GAS with the chemical symbol Ar, while Xenon is a heavier noble GAS with the symbol Xe. Both gases are colorless, odorless, and non-flammable. Argon is the most abundant noble GAS in the atmosphere, making up about 0.93% of the air we breathe. Xenon is much rarer, making up only 0.0000087% of the atmosphere. Both gases have a variety of uses, including in lighting, welding, and medical imaging.