Oxygen-16's an isotope of oxygen. atomic mass: 15.9949146 u excess mass: -4736.998 keV binding energy: 127619.336 keV beta decay energy: -15417 keV atomic percent abundance: 99.762% spin: 0+ possible parent nuclides: beta from N-16, beta + n from N-17, electron capture + p from Ne-17… (More on Oxygen-16)