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Atomic Men

Presentation over Democritus, Aristotle, J. Dalton, J.J. Thomson, E. Goldstein, J. Chadwick, E. Rutherford, N. Bohr. Resources: B. Becknell notes, Boswell High - Ft. Worth TX

Renee Robinson

on 25 September 2015

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Transcript of Atomic Men


John Dalton
J.J. Thomson
Niels Bohr
English Physicist (1891-1974)
In 1932, he confirmed the existence of the neutron using head-on elastic collisions
Around 400BC he established the first Atomic Theory.
Believed that all matter was composed of small indivisible and indestructible particles he called atoms (from the Greek word atomos).
No evidence to prove his theory.
Greek (384-322 BCE)
In 367, sent to study philosophy with Plato
Unlike Plato, he saw ultimate reality in physical objects.
Objects were composed of a potential (their matter) and of a reality (their form).

English (1766-1844)
In early 1800's, performed experiments to test his theory and proposed an atomic theory that was the beginning of our present day theory.
Dalton's Theory:
1. all elements are composed of atoms
2. atoms of the same element are
identical, atoms of different elements
are different.
3. atoms of different elements can join
together in single whole-number ratios
to form compounds
4. chemical reactions occur when atoms
are separated, joined, or rearranged but
an atom of one element never changes
into an atom of another element in a
chemical reaction
Model of atom: said the atom was like a hard billiard ball, no nucleus, no electron cloud
German Physicist
In 1886, he observed a cathod-ray tube and found rays traveling opposite to that of the cathode rays.
He concluded that these were positively charged particles called protons.
Danish Physicist (1885-1962)
Student of Rutherfords
In 1913, proposed that electrons orbit around the nucleus and have a fixed energy (energy level).
Planetary Atom Model: similar to Rutherford's model but the electrons were in different energy levels orbiting the nucleus
English (1856-1940)
In 1897, discovered electrons using a cathode ray tube
Plum Pudding Atom Model: the "pudding" made up most of the mass of the atom and the protons throughout-- the "plums" were negatively charged particles scattered in the "pudding"
English prof (1871-1937)
Found that the atom is mostly empty space; concluded that all the mass is concentrated in a small region called the nucleus. He discovered this by running the gold foil experiment (watch video!).
Planetary Atom Model: the atom has a nucleus in the center with the electrons orbiting the nucleus much like the earth orbits the sun (electrons were all the same distance from the nucleus)
Learn about the modern atomic theory which includes Heisenberg and Schrodinger by watching the videos below.
Robinson - 2013
Full transcript