<P> Naturally occurring oxygen is composed of three stable isotopes , O , O , and O , with O being the most abundant ( 99.762 % natural abundance ) . Depending on the terrestrial source , the standard atomic weight varies within the range of ( 15.99903 , 15.99977 ) ( the conventional value is 15.999 ) . Known oxygen isotopes range in mass number from 12 to 24 . </P>
<P> Naturally occurring oxygen is composed of three stable isotopes , O , O , and O , with O being the most abundant ( 99.762 % natural abundance ) . Depending on the terrestrial source , the standard atomic weight varies within the range of ( 15.99903 , 15.99977 ) ( the conventional value is 15.999 ) . Known oxygen isotopes range in mass number from 12 to 24 . </P>
how many isotopes of oxygen occur naturally on earth
how many isotopes of oxygen occur naturally on earth
three stable isotopes
three stable isotopes