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As far as we have learned, covalent bonds are only made between nonmetals. However, I did some research and discovered an example of a covalent bond between a metal and nonmetal. Aluminium is a metal but it can bond covalently with chlorine to form aluminium chloride during high temperatures. Aluminium chloride is only ionic in the solid state at low temperatures. So I believe exceptions like this do exist, but we haven't gone that in-depth at this stage and I don't want to make it seem like we need to know this. I think we only need to know the fact that generally, covalent bonds are between nonmetals.
Usually, covalent bonds are between two nonmetals and involves the sharing of electron pairs between atoms. There might be some exceptions to it, as the individual above stated but mainly, covalent bonds are between two nonmetals.
Covalent bonds are formed between nonmetals because nonmetal atoms are not strong enough to take an electron away from the other atom involved. A covalent bond is simply a bond created by the sharing of electrons between two atoms. Metals form ionic or metallic bonds because they don't have a strong hold over their electrons and thus have low ionization energy, making it easy for atoms with high electronegativity to take their electrons and form an ionic bond.
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