Why did we discard oxygen as a reference atom to determine the atomic masses? [urgent answer] Share with your friends Share 1 Kirti Gogia answered this Please refer to the following linkhttps://www.meritnation.com/ask-answer/question/why-was-the-atomic-mass-of-1-atom-changed-from-1atom-of-oxyg/atoms-and-molecules/3200509 -6 View Full Answer