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KIT'S ATOMIC GLOG
Well I, Aristotle, think that all things are made of earth, air, fire and water!
J.J. Thomson (Right) used cathode ray tubes and various fields in his experiments which discovered the existence of sub-atomic particles. He proposed the plum pudding model of the atom. The plum pudding model was comprised of a positive atom with negative electrons randomly embedded throughout the inside.
The Heisenberg Uncertainty Priniciple stated that it is impossible to take measurement of both an electron's position and momentum at any given time.
John Dalton's Atomic Theory -All matter is composed of indivisible, indestructible atoms. -All atoms of an element have the same properties. -Atoms of two or more elements can combine to form compounds. -Chemical reactions occur when atoms are rearranged.
Rutherford's Gold Foil Experiment Ernest Rutherford fired alpha particles at a thin sheet of gold foil. He expected most of the atoms to pass through, but many were reflected back at wide angles. This lead to the discovery of the nucleus.
Bohr Model vs. Modern Model Bohr's model for the atom illustrated the electrons' orbits as regular circles, like the orbit of the planets. Today we know that there is no way to ascertain the exact orbit of electrons, so we use the "Electron Cloud" model. The Bohr model, while now archaic, is still widely taught in middle school and Biology because it is more simply illustrates the idea of electron position in terms of chemical reactions and other common applications of electron placement in basic science.
Sub-Atomic Particles Neutron- Neutral charge, found in the nucleus Proton -Positive charge, found in nucleus Electron- Negative charge, orbits around the nucleus Rutherfordium (267) Protons: 104 Neutrons: 163 Electron: 104
I, Democritus, present the idea of an indivisible particle that makes up all things. I will call this particle the atom!
Dalton's model likened the atom to a billiard ball. While it was very similar to Democritus' atom he also said that atoms were indestructible, and all atoms of an element are identical.
Democritus presented the idea of an indivisible particle that makes up all things. He called this the atom, from the Greek word "Atomos" meaning indivisible.
Thomson's Plum Pudding Using a cathode ray tube and various electric and magnetic fields, Thomson discovered the existence of subatomic particles and disproved Dalton's statement that atoms are indivisible. Thomson showed the atom as being positive, embedded with negative electrons.
Rutherford's Model When Rutherford performed his gold foil experiment he discovered the existence of a positive nucleus. He also proposed that are negative electrons orbiting the nucleus.
Bohr's Model Bohr's model showed electrons orbiting a positive nucleus in planer-like orbits. He introduced the idea of quanta bewteen which electrons could jump as they gained or lost energy.
Bohr won for physics in 1922
Rutherford won for chemistry in 1908
Heisenberg won for physics in 1932
Sorry Dalton, no prize for you!
300 B.C
1897
1909
1913- Mid 1900s
