-
500 BCE
The Alchemist
By breaking down the chemical composition of the 4 basic elements of its period. -
427 BCE
Plato
Introduced the atomic theory in which atoms are broken down mathematically -
400 BCE
Deomocrtus
Theorized that everything is made of small atoms -
384 BCE
Aristotle
Believed that all materials on earth aren't made of all atoms, but elements. -
Robert Boyle
He helped develop a new definition of an element. Which was any substance that can be broken into 2 or more substances is not an element -
Lavoisier
Found that mass is conserved in a chemical reaction. Atoms aren't created or destroyed -
John dalton
His theory was the first complete attempt to describe all matter and its properties -
Dimitri Mendeleev
He discovered that all known chemical elements were arranged in order of increasing atomic weight. Resulting the table is dis played with a pattern. -
JJ Thomson
Discovered that all atoms contain tiny negatively charged electrons. (His method was the plum pudding method) -
Curies
Conducted own experiments on rays. The ray was theorized and came from an atomic structure -
Albert Einstein
He proud existence of atoms. And revolutionized all science through the use of atoms -
Robert Millikan
His success was the determination of the charge carried by an electron. -
Ernest Rutherford
Kept studies of radioactivity and the atom. And he discovered empty space in the atom, with concentrated mass in a central positively charged nucleus. -
Neils Bohr
Proposed a theory for the hydrogen atom based on quantum theory. That energy transferred electron. Which move around the nucleus only in prescribed orbits -
Henry G. J. Mosely
Proved that every element identity uniquely determined by the number of protons it has. -
Werner Heisenberg
formulated mechanics for certain principles for the atom
