Early Ideas
He proposed the idea that matter is made of indivisible particles.
Who is Democritus?
Who is J. J. Thompson?
It is the subatomic particle that varies within isotopes.
What is the neutron?
It is the location of the protons and neutrons in an atom.
What is the nucleus?
He believed matter was continuous and not made of atoms and refuted the ideas of Democritus.
Who is Aristotle?
The tool used to discover the electron.
What is the cathode ray tube?
This nuclear particle does not change depending on the isotope of the element.
What is the proton?
What is the electron?
What Democritus called the small, indivisible particles that vary in size and shape.
What is atomos?
What Robert Millikan contributed to atomic theory.
What is the charge of the electron?
It is the sum of the protons and neutrons.
What is the mass number?
What is the proton?
Earth, Water, Fire, and Air
What is the four elements Aristotle believed all matter was made of?
It was discovered with the gold foil experiment.
What is the nucleus?
What is the number of neutrons?
It is the neutrally-charged particle in an atom.
What is the neutron?
He was Democritus's teacher and originally proposed atoms, but not at the robust level that Democritus ultimately did.
Who is Leucippus?
The name of J. J. Thompson's model of the atom.
What is the Plum Pudding Model?
What is average atomic mass?
These are the areas in which electrons can be found.
What are the orbitals?