Which is the most abundant non-metal on the earth?

Most abundant non-metal on the earth:

Oxygen is the most abundant non-metal on the earth. The chemical formula of oxygen (dioxygen) is O₂. This formula is given so because oxygen usually combines with another oxygen by forming a covalent bond.

Composition of the atmosphere – Oxygen

• The atmosphere is composed of 21% oxygen.
• It is used by all living things and is essential for respiration.
• It is obligatory for burning.