What is the meaning of Noble_gas?
Any of the elements of group 18 of the periodic table, being monatomic, usually inert (with very limited exceptions), and gaseous at familiar temperatures.
Source: wiktionary.orgSearch words containing
Any of the elements of group 18 of the periodic table, being monatomic, usually inert (with very limited exceptions), and gaseous at familiar temperatures.
Source: wiktionary.orgSearch words containing