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When you have an example like the one that professor went over during lecture with 2 cations and 1 anion where do they bond together if they all have full valence shells? I believe the example was ammonium sulfate (NH4)2+ (SO4)2-
In the case of (NH4)+ and (SO4)2-, (NH4)+ only has a full valence shell because it gave up one of its electrons, generating a positive charge and (SO4)2- only has a full valence shell because it stole two electrons, generating the negative 2 charge. Cations and anions form ionic bonds through this transfer of electrons. Covalent bonds are the bonds that share electrons to form full valence shells.
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