[Ni(NH3)2O2]Br2

[luludaly2B]

I'm having trouble figuring out the charge of nickel from the mini marshmallow worksheet, and it's different from the answer key. The formula is [Ni(NH₃)₂O₂]Br₂. Could someone help me out? Thanks!

[Nathan Chu 3H]

I believe it is an error and there is only one oxo ligand.

[tamara masri_3D]

Hi! I'm not sure what the answer key says but I'm pretty sure that the oxidation number of Ni is 6+. You can solve for this by looking at the fact that NH3 is neutral, so that won't affect it. Next, we see that there are 2 O atoms attached and we know that O has an oxidation state of -2, multiplied by 2 for 2 atoms, which gives you a -4. Then, we see that the overall neutral molecule also includes 2 Br molecules, each with a charge of -1, giving you another -2. So you know that the total charge inside the brackets has to be +2(to counteract the Br). But it also has to counteract the O2, right. So to be neutral overall, -2+-4+x=0 and x=+6 hope this helps!

[jessicasilverstein1F]

What does the answer key say? I believe that o2 has a nuetral charge and each Br has -1 so it should be nickel with +2 charge