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## Homework Statement

In the equation for the bohr model of the atom, what is the n value for Li2+ ion?

## Homework Equations

E = -2.178 x 10^-18J(z^2/n^2)

## 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?