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400 BCE
Leucippus & Democritus
These two worked together and created an Idea of matter. They thought that everything had tiny particles in it and the more that you cut an object it will eventually end at a particle that can not be cut anymore they called this A Tomos or atoms -
Period: 400 BCE to
History of Atomic Theory
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Period: 400 BCE to
History of Atomic Theory
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Antoine Lavoisier
Antoine came up with the Laws of Conservation of Matter which basically states that mass cannot be created or destroyed making matter unchangeable or it cannot change. -
John Dalton
The maker of elements. John is the one who said that the elements were discrete pockets of matter -
Dmitri Mandeleev
The maker of The Periodic Table of Elements -
Joseph john Thompson "JJ Thompson"
JJ measured heat from a discharge tube and how much magnets can bend the charge. He founded out that the mass of the charge was 100 times lighter than hydrogen. He called these particles Corpuscles those are now what we call electrons. He created model that resembled a common dessert plum pudding. His model was then called the plum pudding model from then on. -
Ernest Rutherford
Ernest was conducting an experiment with a gold-foil and this experiment ended with him figuring out that the atom was mostly empty space. He then called this the nucleus -
Niels Henrik David Bohr
Niels used math to calculate the specific number and place of electrons. His models are now called the Bohr Diagrams -
Fredrick Soddy
Came up with isotopes and made the theory that radiation is due to the transmutation of elements -
Werner Karl Hiesenberg
Werner also used math and came up with the Quantum Theory along with 3 other people. The Quantum Theory is scientific laws that describe the behavior of photons, electrons and the other particles that make up the world. -
James Chadwick
James used kinematics and was able to determine the velocity of the protons.
