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Covalent bonds form when two nonmetals share an electron.

Hi Covalent bonds occur when nonmetal elements have a unstable outermost shell know as the valence electrons. The two non-metal either give up of gain electrons and then live with the other element or elements outer shell. A common everday example is water also know as H20 it has 2 hydrogens and one oxygen. Oxygen's has 6 valence electrons so it need to electron to have a full outermost shell. Hydrogen has one 1 electron in its valence shell, so one 1 electron joins the 6 electron, but oxygen needs 8 for a full outer shell so another hydrogen joins in and then all three have full outer shells because they all live in the valence shell. Hydrogen joins oxygen because it wants to get rid of its valence cell, so another joins in so oxygen can get a full shell and they all can live together in the valence shell.

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