Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I) are elements in the same group on the periodic table. Why are these elements grouped together? They all have similar properties.

They all have similar atomic masses.

They all have the same atomic radius.

They all have the same number of protons.

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.