<P> The noble gases ( historically also the inert gases ) make up a group of chemical elements with similar properties ; under standard conditions , they are all odorless , colorless , monatomic gases with very low chemical reactivity . The six noble gases that occur naturally are helium ( He ) , neon ( Ne ) , argon ( Ar ) , krypton ( Kr ) , xenon ( Xe ) , and the radioactive radon ( Rn ) . Oganesson ( Og ) is variously predicted to be a noble gas as well or to break the trend due to relativistic effects ; its chemistry has not yet been investigated . </P>
<P> The noble gases ( historically also the inert gases ) make up a group of chemical elements with similar properties ; under standard conditions , they are all odorless , colorless , monatomic gases with very low chemical reactivity . The six noble gases that occur naturally are helium ( He ) , neon ( Ne ) , argon ( Ar ) , krypton ( Kr ) , xenon ( Xe ) , and the radioactive radon ( Rn ) . Oganesson ( Og ) is variously predicted to be a noble gas as well or to break the trend due to relativistic effects ; its chemistry has not yet been investigated . </P>
what do helium argon and neon have in common
what do helium argon and neon have in common
odorless colorless monatomic gases very low chemical reactivity
odorless colorless monatomic gases very low chemical reactivity