Neutral atom contains 22 protons and 24 neutrons

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Which is an example of a reversible physical change?

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion