2. How many moles are present in a sample of aluminum nitrate with a mass of 17.40 g?

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 produces wave a)sound b) heats c)transfer of energy d)vibrations

What does an electron configuration for an atom relate to the atoms placement on the periodic table