History of the Atom Crossword

Defined an element as any substance that cannot be decomposed into a simpler substance
Formed the Atomic Theory in 1808
________ Ball Model showed atoms as solid, hard spheres
J.J. who discovered electrons
Determined the size of the charge on an electron
Plum _______ Model showed that the atom was roughly the same consistency throughout with negatively-charged electrons scattered about in it
Performed the Gold Foil Experiment
Atomic ______ is the number of protons in the nucleus
Atomic ____ is the average mass of the atom
Discovered neutrons
Came up with the "Quantum Mechanical Model" of the atom
His uncertainty principle states that we cannot measure the position and the momentum of a particle with absolute precision
Subatomic particle that has a positive charge
Subatomic particle that are not located in the nucleus
Discredited the ideas of Leucippus and Democritus
Subatomic particle that has no charge
High-vacuum _______-___-____ was a piece of equipment that Thomson used to study the nature of electric discharges
Millikan used this experiment to discover the charge on an electron
Rutherford's model of the atom
____ model of the atom where electrons are orbiting the nucleus on different energy levels