Why are most elements usually found as part of a compound and not as pure elements

A good explanation is the “Ideal State for Electrons”, like the Noble Gases; but unlike these Noble Gases, with filled outer Shells of electrons, Halogens are -1, and other elements, +1 and so on, so the most stable, and filled electron shells can be created.

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i know insulin is primary but i dont know the others im sorry

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