2ND QUARTER
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24 Terms
atoms
the smallest particles of an element
electrons
a particle with negative charge
proton
a particle with positive charge
neutron
a particle with no electric charge
nucleus
contains protons and electrons
eugen goldstein
discovered the proton
democritus
a Greek philosopher who began the search for a description of matter
aristotle
believes all matter was made up of the 4 elements
fire, water, air, and earth
what are the 4 elements?
john dalton
an english chemist who performed multiple experiments which led to the acceptance of the idea of atoms
joseph john thompson
an english scientist who discovered electrons
josheph john thompson
who used the cathode ray tube?
cathode ray tube
a vacuum tube which emits electron beams, that can be manipulated to display images on a screen
joseph john thompson
who made the plum pudding model?
ernest rutherford
an english physicist in 1908 who fired a particles at a piece of gold foil
niels bohr
a danish scientist in 1913 who placed electrons in a specific energy level
arnold sommerfield
he said that orbits can also be elliptical
erwin schrodinger
a physicist and biologist and is the father of quantum mechanics