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. Read more..
Atomic number is a term used to describe the number of protons in the nucleus of an atom of a particular element. Read more..
Element is a term used to describe a substance that cannot be broken down into two or more new substances by chemical or physical processes
Isotopes are Atoms of a given chemical element having the same atomic number but different atomic mass numbers. Read more.
An electrically neutral subatomic particle with a mass approximately equal to one atomic mass unit; generally found within an atomic nucleus. Read more..