Final answer:
The compound Cu(NO3)2 is named copper(II) nitrate, signifying that copper has a 2+ charge and is balanced by two nitrate ions.
Step-by-step explanation:
The compound Cu(NO3)2 is known as copper(II) nitrate. When naming ionic compounds containing a metal with more than one common ionic charge, the charge is specified using Roman numerals in parentheses after the metal's name. In copper(II) nitrate, copper has a charge of +2.
The compound consists of one copper ion (Cu2+) and two nitrate ions (NO3−). As an ionic compound, it is important that the charges balance out, so the formula Cu(NO3)2 indicates that the total charge from the two nitrate ions (each with a −1 charge) balances the charge from one copper ion (with a +2 charge).