Given that oxygen-16 and oxygen-18 both have an atomic number of 8, how many electrons, protons, and neutrons do these oxygen atoms contain? a. both oxygen isotopes contain 8 electrons and 8 protons but each contains a different number of neutrons - 8 and 10 respectively. b. the oxygen isotopes contain 8 electrons but each contains a different number of neutrons and protons - 8 and 10 respectively. c. these oxygen configurations contain the same number of subatomic particles - 8 electrons, 6 protons and 10 neutrons. d. any oxygen atom contains 8 electrons and 9 neutrons but these vary in the number of protons - 8 and 10 respectively.