Can oxygen be by itself?

Related questions

1. Do astronauts breathe pure oxygen?
2. Do we breathe nitrogen?
3. Does oxygen make you sleepy?
4. What is oxygen used for?
5. Does oxygen always have 2?
6. How do we breathe only oxygen?
7. Is air the same as oxygen?
8. What does oxygen mix with?
9. Is liquid oxygen dangerous?
10. What are the side effects of using oxygen?

Tags

1. #lower
2. #exist
3. #sharing
4. #other
5. #energy
6. #electrons
7. #atomic
8. #around
9. #oxygen
10. #another
11. #level
12. #separated
13. #atoms