An atom of oxygen has an atomic number of 8 and a mass number of 18. how many of each type of subatomic particle does it contain?

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

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.

Ineed ! i have no clue how to do this problem.