Who suggested that the molecular formula for water is h2o not oh

Iknow #2 is d. i just need to know why

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.

Give the orbital configuration of the phosphorus (p) atom.