Which of the following is an anion?

a. o2–
b. mg2+
c. al3+
d. h

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.

Particles vibrate in a rigid structure and do not move relative to their neighbors.

What does the mass of 0.7891 mol of ferric oxide (fe2o3)