How many atoms are in Cu3 (NO3)2?

In the chemical formula Cu₃(NO₃)₂, there are three copper (Cu) atoms and two nitrate (NO₃) groups. Each nitrate group contains one nitrogen (N) atom and three oxygen (O) atoms, totaling two nitrogen and six oxygen atoms from the two nitrate groups. Therefore, the total number of atoms is 3 (Cu) + 2 (N) + 6 (O) = 11 atoms.