So I'm new to this but I have a question about atomic structure.
The Lithium ion, Li2+, consists of a single electron moving about the Lithium nucleus.
Calculate the gravitational force, and the electrostatic force on the electron, which is at a distance of one-third the Bohr radius from the nucleus.
( a0 = 0.5292 Å, gravitation constant: G = 6.672 x 10-11 N m2 kg-2)

I don't get it these calculations.