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Comples ions help?

Can someone please explain why when [Cu(H2O)6]2+ reacts with NH3 it forms [Cu(NH3)4(H2O)2]2+

But when [Co(H2O)6]2+ reacts with NH3 it forms [Co(NH3)]2+ ?

Why isn't [Co(NH3)4(H20)2]2+ formed instead?

Thank you in advance!

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