Oxygen

Oxygen is a colour less odourless highly reactive gas. It coverce about 20.95% of in Earth's atmosphere. It is on of the heaviest gas and the third coman gas in the universe.

It is the most abudant elemat in the human body and make up up to 65% of the mass of our body. It is comanly used to humans,animals and plants to breathe and almost every creature in earth earth depends on it.

---

Oxygen profile

---

Atomic numbers - 8
Group - group 16 (chalcogens)

---