Theory of Atom

Greek thinker, called nature's basic particle an atom, based on the Greek word "atomos" which means "indivisible". Did not have evidance that atoms existed.

Who is this person?

Danish physicist who in 1930 suggested that the energy of each electron was related to the electron's path around nucleus.

English chemist; like Democritus, he believed that atoms are the fundamental units of matter and are indivisible. Atoms of the same element are alike; was able to base his theory on experimental evidence. Parts of his theory included the Law of Multiple Proportions and The Law of Conservation of Mass.

Thomson is responsible for discovering that an atom contains

Whose model determined that an atom's positive charge is concentrated in the atom's center?

Austrian scientist; treated electrons like waves; in 1926 credited with discovering the ELECTRON CLOUD MODEL.

English physicist; responsible for discovering electron using cathode-ray experiment. This meant that atoms could be divided into smaller parts. Also credited with "plum pudding model" where electrons were like plums embedded in a positively charged "pudding".

New Zealand scientist; famous for gold-foil experiment; concluded that the atoms positive charge is concentrated in the nucleus and that the nucleus is very small in relation to the atom and very dense. The negative electrons orbit the positively charged nucleus much like planets orbit the sun.