Rutherford's famous gold foil experiments shot heavy particles at a thin sheet of gold foil. what did he observe, and why did these observations eventually result in the addition of a nucleus to the atomic model? some of the heavy particles bounced off the foil, because there are positive particles spread throughout the atom. some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom. the heavy particles all passed straight through the foil, because the atoms are mostly empty space. the heavy particles all bounced off the foil, because the subatomic particles have mass and volume.

Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.

Explanation:

The conclusion from Rutherford’s gold foil experiment:

1.Most of the particles passed through the undeflected proving that most of the atm is empty space.

2.Some of the particles deflected by small angle proving that the center of the atom has a positive charge.  

3.Also some of the particles travel back from the foil or bounced off the foil proving that the entire mass of the atom is located in the center also known as the nucleus of the atom.  

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.