An alpha particle (made of 2 protons and 2 neutrons) with initial kinetic energy of 1.20 × 10^-12 J travels directly towards the nucleus of the stationary zinc atom The nucleus of a zinc atom contains 30 protons and 35 neutrons, and has a diameter of 4.00 × 10^-13 cm. The alpha particle slows as kinetic energy is converted to electrostatic potential energy. Calculate the minimum distance between the centre of the zinc nucleus and the alpha particle. For simplicity, assume the charge of the nucleus to be concentrated at its centre. Express your answer in terms of the radius of the zinc nucleus i cant put down my thoughts so far as i dont know where to start, i can't find an equation that lets you find distance with the data given so far, i would need to know the charge on the zinc & alpha particles ? i guess i can work this out from the charges on the protons & neutrons ?