History of the atom Flashcards
(13 cards)
Order of peoples discoveries
Dalton
Thomson
Rutherford
Bohr
Chadwick
Don’t Throw Really Badly Constantly
Who found protons
Ernest Rutherford
Who found electrons
J.J Thomson
Who found shells
Niels Bohr
Who found neutrons
James Chadwick
Order of discovery of neutrons, shells, electrons and protons
Electrons-1897
Shells-1913
Protons- 1919
Neutrons- 1932
What was Democritus’ theory
Atomic theory, idea that atoms existed
What was John Daltons theory
Idea of “solid spheres., different spheres made up different elements
What was Ernest Rutherfords theory
Alpha particle scattering graph, later discovering protons
What was Niels Bohr theory
Electrons were on shells
What was James Chadwick’s theory
Neutrons
What was the alpha particle scattering experiment
-they fired … charged … particles at a very … sheet of gold …
-from the … pudding … they … them to … straight … the …
-most of the … indeed did go … but a … were … and … went …
-so the … pudding … was proven …
-he believed there was a … in … and the rest was mainly … space
-the … particles that hit the … were reflected …, the ones that were … the … were … and the other ones just passed … through the …
-they fired positively charged alpha particles at a very thin sheet of gold foil
-from the plum pudding model they expected them to pass straight through the sheet
-most of the particles indeed did go through but a lot were deflected and some went backwards
-so the plum pudding model was proven wrong
-he believed there was a nucleus in atoms and the rest was mainly empty space
-the alpha particles that hit the nucleus were reflected backwards, the ones that were near the nucleus were reflected and the other ones just passed straight through the atom
What did Bohr propose
-… model
-suggested … contained …
-… orbited the … on … shells
-nuclear model
-suggested atoms contained shells
-electrons orbited the nucleus on fixed shells
