Answer is: Rutherford demonstrate that <span>J.J Thompson's Plum Pudding model was not accurate.
</span><span>Rutherford theorized
that atoms have their charge concentrated in a very small nucleus.
</span>This was famous
Rutherford's Gold Foil Experiment: he bombarded thin foil of gold
with positive alpha particles (helium atom particles, consist of two protons and two neutrons).
Rutherford observed the
deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.
That is different from Plum Pudding model<span>, because it shows that most of the atom is empty space.</span><span>
</span>
The mass law is LAW OF CONSERVATION OF MASS.
The law of conservation of mass states that mass, in an isolated system is neither created nor destroy by chemical reaction or physical transformations.
This implies that, the mass of the chemicals before the reaction will be equal to the mass of the product after the reaction.
