Question

Question #591fd

Answer 1

check his gold foil experiment

Explanation:

He found out that the atom's mass is mainly concentrated on the centre. He also discovered that there is positive charged particles in the atom called proton. He found out this when he bombarded the gold foil with alpha particles.

http://chemed.chem.purdue.edu/genchem/history/gold.html

check this link. hope this works :)