Atomic Theory, Atomic Structure, Scientists, Masses, Charges, and Elements
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
Science Vocab 147928
