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Question	Answer
Charge of electron	e-
Charge of proton	p+
Charge of neutron	n0
What is atomic number?	number of protons or electrons in an atom
What is mass number?	number of protons + number of neutrons in an atom
Lucretius	smaller particles, and a poet
Democritus	world is empty space and atoms, no evidence, philosopher
Aristotle	matter is continuous, Democritus was full of feces
Newton and Boyle	atomic nature of elements, no proof
Dalton	1800's, 1st atomic theory based on proof
Dalton's Theory	All matter is composed of atoms, Atoms of the same element are identical, Atoms of different elements are not identical, Atoms unite in ratios to form compounds, and Atom is the smallest particle
Lavoisier	Law of Conservation of Mass
Proust	Law of Definite Proportions-elements can always combine in the same ratio
JJ Thomson	Discovered the electron, first to use cathode ray tube
Goldstein	Used modified cathode ray tube
Millikan	Discovered mass and charge of ELECTRONS, oil drop experiment
Rutherford	Discover NUCLEUS, gold foil experiment, mostly empty space, small-tense-positively charged
Sir James Chadwick	Discovered NEUTRON, has NO CHARGE,
Canal rays later named...	protons
Mass of p+	mass of n0, 1 amu
Mass of n0	mass of p+, 1 amu
Mass of e-	1/1840 amu
Isotopes	elements that have the same number of protons and a different number of neutrons
Hydrogen isotopes	Protium, Deuterium, Tritium