Unit 3: Atomic Structure

Democritus model

indivisible atom

John Dalton model

the atom is a solid indivisible field

JJ Thomson model

negative electrons are embedded in a sea of positive charges; plum pudding

Rutherford model

positive charges are located within a central nucleus; gold foil experiment

Bohr model

electrons are in fixed circular orbits with different energy levels

Wave-mechanical model

matter and energy properties; orbitals are regions of the most probable location of an electron