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

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Solution

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.

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(a) Name the most abundant metal in the earth's crust
(b) Name the most abundant non-metal in hte earth's crust.