When a stable atom gains or loses its electrons then that’s when it becomes the ion.
Equilibrium occurs when the rate of the forward reaction is the same as the rate of the reverse reaction. This doesn't necessarily mean the concentrations or pressure are the same on both sides of the equation, only the rates are the same
You got the questions correct
'cause alphe-particle which was +ve charge, get repulsion from the atom, so he deducted that.......