Practicing Success
What is the percentage of oxygen in the atmosphere ? |
24 % 78% 21% 0.03% |
21% |
The correct answer is Option (3) – 21% Oxygen is a very abundant element on our Earth. It is found in the elemental form in the atmosphere to the extent of 21%. It also occurs extensively in the combined form in the Earth’s crust as well as also in the air in the form of carbon dioxide |