Chapter 4 Flashcards
the smallest unit of an element that maintains the properties of that element
atom
he developed the theory that if you cut something over and over again, you would run out of things to cut once you reached a certain point
Democritus
he disagreed with Democritus and he thought that you would never run out of things to cut
Aristotle
he came up with the first atomic theory
John Dalton
a subatomic particle that has a negative charge
Electron
he came up with the plum pudding model, discovered electrons, and did the (BLANK)’s Cathode-Ray Tube Expirememt
Thomson
he did the (BLANK)’s Gold-Foil Experiment and made a model of the atom
Rutherford
in physical science, an atom’s central region, which is made up of protons and neutrons
nucleus
a region around the nucleus of an atom where electrons are likely to be found
electron clouds
he said that electrons moved around in certain paths
Niels Bohr
a subatomic particle that has a positive charge and is found in the nucleus
proton
a unit of mass that describes the mass of an atom or molecule
atomic mass unit (AMU)
a subatomic particle that has no charge and is found in the nucleus
neutron
the number of protons in the nucleus of an atom; is the same for all atoms of an element
atomic number
an atom that has the same number of protons but a different number of neutorns
isatope
