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Jan 1, 1400
Democritus
Democritus lived in 460 BC to 370 BC In Greece, He said everything is made of atoms, and nothing else.
He basically explained that Atoms are not all the same as some people thought they were the same shape etc. -
John Dalton
What discovery on the atom is the scientist noted for? James Dalton is best known for his pioneering work in the development of modern atomic theory.
How did this discovery change our view of the atom? • 1. All matter is made up of tiny particles2. Atoms are indestructible and you can’t change them3. Elements are characterized by the mass of there atoms 4. When elements react their atoms combine in simple, whole-number ratios -
J.J Thomson
When did this scientist live? J.J Thomson was born on the 18th December 1856 and died on the 30 August 1940
What discovery on the atom is the scientist noted for? J.J Thomson discovered the electron leading to his plum-pudding model
How did this discovery change our view of the atom? J.J Thomson identified that electrons inside an atom could show that they were not invisible. Electrostatic forces positioned electrons -
Hantaro Nagaoka
When did this scientist live? August 15 1865 – December 11 1950
What discovery on the atom is the scientist noted for? The Japanese Scientist suggested that an atom had a central nucleus.
How did this discovery change our view of the atom? Hantaro Nagaoka contributed the theory of an central nucleus and his atomic theory has described simular to the sings of Saturn. -
Niels Bohr
When did this scientist live? 7th October 1885 – 18th November 1962
What discovery on the atom is the scientist noted for? Niel’s applied quantum theory to Rutherford’s atomic structure by assuming that electrons travel in stationary orbits defined by their angular momentum.
How did this discovery change our view of the atom? Niel’s discovery made us realizes that electrons travel and do not just stay stationary. -
Erwin Schrodinger
When did this scientist live? 12 August 1887 – 4th January 1961
What discovery on the atom is the scientist noted for? Made and equation to find the probability for where the electron is in an atom: H(psi) = E(psi)
How did this discovery change our view of the atom? Erwin changed our view of the atom by saying the electrons where arranged in orbitals rather than electrons being distributed within an electron configuration of shells and energy levels. -
Ernest Rutherford
When did this scientist live? 30th August 1871 – 19 October 1937
What discovery on the atom is the scientist noted for? Ernest Rutherford states that a atom has a dense positively charged nucleus
How did this discovery change our view of the atom? Ernest Rutherford found that when the nucleus of an atom of gold met with the positive charger proton it rebounded due to the like charges repelling -
James Chadwick
When did this scientist live? 20th October 1891 – 24th July 1974
What discovery on the atom is the scientist noted for? James Chadwick is most known for his discovery of the neuron.
How did this discovery change our view of the atom? James Chadwick’s discovery changed our view on the atom by showing that there is a neutrally charged atoms.
