Which information in the periodic table indicates the number of protons in an atom?       a. the position of the element in its column               b. the element’s chemical symbol c. the element’s atomic mass d. the element’s atomic number

Does the energy in a solid increase or decrease when changing to a liquid?

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 three statements represent the benefits of performing experiments using computer simulations?