Question

which is the strongest substance on Earth on the the basis of the classification of elements
( metal , non metal , metalloid )​

Answer 1

Answer:

Obviously metal

but diamond is the hardest which is a non metal it is an exception.

Answer 2

Answer:

metal are strongest substances in the earth

But there is some exceptions

i.e diamond

diamond is hardest substances in the earth BUTit is a non metal

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