What determines an atom's physical properties?

What is the atomic number?

What two particles make up the atomic mass unit?

Why did Democritus call the smallest bits of matter "atomos"?

True or False: Atoms cannot be created or destroyed.

J.J. Thompson is credited with discovering

While trying to prove his teacher's theory, Rutherford accidentally discovered:

True or False: Atoms are mostly empty space.

The Bohr model suggests that electrons travel in very specific paths around the nucleus, called:

The closer electrons are to the nucleus, the ____ energy they have.

What did Rutherford expect to happen when he performed the gold foil test?