Difference between 3O and O3 Share with your friends Share 2 Geetha answered this 3O means three atoms of oxygenO3 means molecule -called ozone. But both has the same massi.e., 3 × 16 = 48 u 3 View Full Answer Khaja Naveeduddin answered this 30 is the numer 03 is oxygen 3 times 2 Koushik Mitra. answered this 30 is number and o3 is ozone -1 Tulsi Mehta answered this 3 O means three atoms of oxygen O3 means the molecule of oxygen 5 Tulsi Mehta answered this thumbs up to my answer plz -4 Gagans Vipassana answered this (3Oxygen) means three atoms of oxygen is present in this.(O3) means 3 molecules of oxygen present in this element 2 Riya Kamdar answered this 3O means 3 atoms of oxygen and 03 means one molecule of ozone. 2