History Of The Atom Flashcards
Robert Boyle
If gases are made of atoms, gasses can be compressed.
Democratus
He said atoms were small, different in shape and size, always moving, and capable of joining, but he had no proof.
Antoine Lavoisier
Water is made of oxygen and hydrogen, therefore water is not an element it is a compound.
John Dalton
Elements are composed of the same type of indestructible atoms.
Atoms from different elements can combine to form compounds.
Spherical structures with equal masses.
J.J. Thompson
Discovered electrons, + and - charges are equally spaced.
Earnest Rutherford
Discovered the proton that is clustered in the nucleus
James Chadwick
Discovered the neutron with evidence. He worked for Rutherford.
Niels Bohr
Electrons are in specific energy levels around the nucleus. (Like planets in the solar system)
Modern atomic theory
Protons and neutrons in nucleus; electrons move in orbitals.
