Lasted edited by Andrew Munsey, updated on June 15, 2016 at 1:43 am.
Mono atomic means "single atom". In physics and chemistryit is stated as "monatomic" is a combination of the words "mono" and "atomic," and ." It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other. Under Standard Temperature and Pressure (STP), all of the noble gases are monatomic. To be a monatomic gas, an element usually has to have zero valence (as for the noble gases) or be a normally diatomic gas under extremely low pressure, as is the case with oxygen in Earth's upper atmosphere. This is also known as m-state.