Question

what is the difference between cu+2 and cu+​

Answer 1

the charge (1+, 2+ etc) is just how many electrons the copper has lost.

So losing one electron makes the Cu atom have a charge of 1+

losing another electrons means it has a charge of 2+ etc

The example reaction you state is not balanced in terms of charge - the left hand side has an overall positive charge while the right hand side has no charge, so you may need to balance this with an electron

HKG

Answer 2

the main difference is the no. of ions

the cu2+ has last it's 2 valence electron
the cu+ has lost its 1 valence electron