Atomic Theory Quiz Flashcards
Who is it? 430 BC, everything in the universe is made of “Atomos”, atoms are dense and indestructible spheres,
Democritus
Who is it? Greek philosopher, believed everything was made of only four elements; earth, water, fire, air; halted the progress of the discovery of atoms for nearly 2,000 years
Aristotle
Who is it? Revised the Greek theory of atoms in 1808, all atoms of the same element are alike, atoms combine to form compounds, published “Atomic Theory of Matter” stating all matter is made of atoms
John Dalton
Who is it? Discovered the Law of Conservation of Mass, been called the “Father of Modern Chemistry”, discovered the element oxygen
Antoine Lavoisier
Who is it? Used the cathode ray tube experiment to discover electrons, proposed atoms have an overall + charge with - charged particles dispersed throughout
J.J. Thomson
Who is it? Discovered that atoms & molecules emit and absorb different levels of energy in the form of electromagnetic radiation.
Max Planck
Who is it? Used Brownian Motion to prove atoms exist, known for his publication of The Theory of Relativity
Albert Einstein
Who is it? Discovered the exact charge of an e’’’
Robert Millikan
Who is it? :
The nucleus contains + charged particles, performed the Gold Foil Experiment & discovered the nucleus is mostly empty space,
Ernest Rutherford
Who is it?
:Found that e” are located in specific energy levels like rungs on a ladder;opened the world of quantum physics, won the Nobel Prize in 1922
Niels Bohr
Who is it?
: Discovered the Quantum Mechanical Model to locate e”; proposed e” do not move in set paths, they move in waves with no definite location
Erwin Schrodinger
Who is it?
: Proposed that you can never know the exact position or speed of an e”. Known as the “Uncertainty Principle”
Werner Heisenberg
Who is it?
: Discovered the neutron(last subatomic particle) in 1932, discovery of neutron led to discovery of nuclear fission and the atomic bomb
James Chadwick
