Based off of the plum pudding model, what should've happened in the gold foil experimet

How will the emission of an alpha particle affect the atomic number of an atom

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

What is the lowest number energy level where a d sublevel is found