Home » Which one is the most abundant in Atmosphere? Science 10-11-2020 by LEAD MCQS Which one is the most abundant in Atmosphere? Oxygen Nitrogen Hydrogen None of these View Answer Nitrogen (N2): 78% of air.Oxygen (O2) : 21%.Argon (Ar) is the third most abundant gas at . 93%. Post Views: 123 Tags: ASSISTANT Punjab Overseas Pakistanis Commission S&GAD – PPSC Past Paper (BS-16)-2020Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment.