A '''subatomic particle''' is any particle that is smaller than or makes up an [[atom]]. At one time this included [[protons]], [[neutrons]], and [[electron]]s, which are known to make up all elements (except ordinary [[hydrogen]] does not have any neutrons). Since that time additional particles have been experimentally detected or theorized. These include [[quarks]] and [[gluons]] which are a level smaller still. | A '''subatomic particle''' is any particle that is smaller than or makes up an [[atom]]. At one time this included [[protons]], [[neutrons]], and [[electron]]s, which are known to make up all elements (except ordinary [[hydrogen]] does not have any neutrons). Since that time additional particles have been experimentally detected or theorized. These include [[quarks]] and [[gluons]] which are a level smaller still. |