The Atmosphere is a term used to describe the mixture of different gasses that surrounds Earth. These gases consist predominantly of nitrogen, oxygen, argon, carbon dioxide, and water vapour. Most people believe the atmosphere is thick.
Atom is a neutral particle having one nucleus, an unimaginably small particle that could not be made any smaller and still behaves as a chemical system.
ATOM ECONOMY CALCULATION
Atomic energy is a term used to describe the constitutive internal power of the atom, which was absorbed when formed.
Atomic mass unit is a term used to describe the mass of a neutral atom of a nuclide.