-
250
Aristotle BC
Discovered that earth was made of earth,water,air,fire -
Dallton
,matter constist of invisible atoms
atomas arranged in different combinations to make different compounds
first experiment to show atoms -
Tomson
Electrons were smaller than atoms
Thought empty space was protons Made plum pudding models -
rutherford
atoms have nucles
gold foil experiments -
Bohr
thought protons and neutrons were like planets around the sun spinning round neucleus in a circular motion -
Heisen and Schrodinger
Electrons not in orbit but like huyper active flies Quantum Mechanical Model Hyperactive orbit called orbitals