What trend is seen in atom size, going down the periodic table?
a. atomic radius gets bigger the lower an atom appeares on the periodic table
b. atomic radius stays the same in a column of the period table
c. atomic radius varies the lower an atom appears on periodic table.
d. atomic radius gets smaller the lower an atom appears on the periodic table.

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.