What is the probable product of a double replacement reaction

Compare and contrast the bohr model and the electron cloud models of the atom.

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.

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