MY SUPER QUALITY TIMELINE OF SCIENTISTS

DEMOCRITUS-400BC

ATOMOS THEORY

• First person to come upmwith the theory of atoms
• Opened up a workd of new scientific potentials
• Stated all mater consists of invisible particles called atoms
• He aso said atoms are homogenous
• Stated liquids are made of large, round atoms

ATAMOS THEORY

• Said oils are made of very small, fine atoms
• Theorized atoms are solid, but invisible
• Stated all mater consists of invisible particles called atoms
• All atoms are indestructible
• Also, Democritus had no existing physical model

ARISTOTLE 380BC

ARISTOTLE-4 ELEMENTS

• Both parents died when he was 10
• His first wife was Pythias
• He did not believe in the Atomic Theory
• Said all things on Earth were made up of the 4 elements Earch, Fire, Wind, Water
• All things were made up of small amounts though

DALTON- 1802

DALTON-BILLIARD BALL

• He initially strictly studied meteorgology.
• Began teaching at 12 years of age
• Nothing within, just the atom itself
• Hyphothesized atoms were spherical
• Hyphothesized atoms were spherical

DALTON-BILLIARD BALL THEORY

• He said all elements are composed of particles called atoms
• He stated some elements are pure, only containing one type of atom
• Also said all elements differ due to the difference in weight

J.J. THOMPSON-1897-1902

THOMPSON-CATHODE RAY

• Used plum pudding in his experiment(s)
• He said there was a spherical cloud around the atom
• All electrons negatively charged
• Thompson discovered electrons
• Also noticed at atom can be divided

RUTHERFORD-1908-MID1900'S

RUTHERFORD-POSITIVILY CHARCHED NUCLEUS

• Rutheford said electrons orbit the nucleus
• Discovered the concept of the nucleus in 1910
• In 1913 he used a cathode ray to bombard atoms, with the help of H. G. Moseley
• Discovered certain light elements could be "disintegrated"

MILLIKAN-1910

MILLIKAN-OIL DROP

• Used a very elaborate device to charge a drop of oil
• Discovered that the nucleus is made up of neutrons
• Also that the nucleus is made of of positivily charged 6 protons
• Electrons surround the nucleus with negative charge

CHADWICK-1913-1919

CHADWICK-PROTON NEUTRON MODEL

• Born into a family with 12 siblings
• At 23years old, he was awarded with a Exhibition Science Sscholarship
• Optimized the neutron
• Found the mass of the neutron was 0.1% more than a proton
• Eventually prepared the way for uranium 235 to be used with the Atomic Bomb

THANK YOU FOR SHOWING SOME INTREST IN MY MEDIOCRE PRESENTATION