Question

Non-metal which is very hard (very short answer)​

Answer 1

Answer:

Carbon

Carbon is a non-metal that can exist in different forms. Each form is called an allotrope. Diamond is an allotrope of carbon and it is the hardest natural substance known.

Explanation:

@Genius

Answer 2

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Sulphur and graphite are soft non-metals, chlorine is gas while diamond is the hardest known non-metal which is an allotrope of carbon. It has the highest value of hardness on Moh's scale.