Question

there are only 118 known elements but million of compounds how.
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Answer 1

Answer:

There are only 118 elements known yet but number of compunds is incredibly large. The reason being that these 118 elements react with each other and lead to the formation of compounds. You can imagine well that if any 1 element reacts with other elements then more than 50 compounds can be formed.

Answer 2

Answer:

because when different elements combine it forms new compound