What is an Atomic Bomb?

An atomic bomb is a weapon  

There are two basic ways that nuclear energy can be released from an atom. In nuclear fission, scientists can split the nucleus of an atom into two smaller fragments with a neutron. Whilst nuclear fusion involves bringing together two smaller atoms to form a larger one. In either process, fission or fusion, large amounts of heat energy and radiation are given off. The discovery of nuclear fission can be accredited to the work of Italian physicist Enrico Fermi. During the 1930s.