Covalent bonds are formed when electrons are shared between elements that are nonmetals. The ammonium ion, NH+4 , would have covalent bonds because both nitrogen and hydrogen are nonmetals. ... So, the bond between this particular hydrogen atom and the central nitrogen is a dative covalent bond.
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A control group is someone who takes control over something so a tyrant or a dictator.
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If this isnt what your looking for let me know, there wasnt alot of context.