The difference between referee and umpire is that referee is keep check on the game while umpire then take care of that check. Example in cricket both are there, one match referee and three match umpires. Referee and third umpire are sitting out side the ground, while two umpires on the field one of them … Read more

An ion is an atom or modules which have lost or gained one or more valance electrons, giving it a positively or negatively charged. An ion consisting of a single atom is called a monatomic ion.  As it turns out an atom contains a central nucleus which has protons and neutrons in it. … Read more