The formula unit for Cr+2 and NO3 -1

B - Cr(NO3)2

Explanation: The +2 on Chromium and the -1 on NO3 indicates the charge. And in order to balance out the charge, you will sometimes need to add more of a substance.

In this case, Cr has a +2 charge and NO3 has a -1 charge. To balance, the total charge needs to equal 0. So, you add another NO3 to make two -1 charges, which will cancel out the +2 charge on Cr.

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explanation:

just did the assignment and the answer was #1 +2 n