1. The problem statement, all variables and given/known data In the equation for the bohr model of the atom, what is the n value for Li2+ ion? 2. Relevant equations E = -2.178 x 10^-18J(z^2/n^2) 3. The attempt at a solution Since it is Li2+ that means it has 1 electron. So z = 1. Now I have an equation with 2 variables (impossible to solve). I dont know what E is and I have to find n. Does anyone have any idea on how to do this?