Atomic Theory

What is inside the nucleus of an atom?

• Only Protons

• Only Neutrons

• Protons and Neutrons

• Protons and Electrons

What determines an atom's physical properties?

• protons

• neutrons

• electrons

• mass

What is the atomic number?

• number of atoms

• number of protons

• number of neutrons

• mass of the atom

What two particles make up the atomic mass unit?

• electrons and neutrons

• electrons and protons

• protons and neutrons

• quarks and muons

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

• Atomos means tiny

• Atomos means uncuttable

• Atomos means atom

• Atomos means cut

True or False: Atoms cannot be created or destroyed.

• True

• False

J.J. Thompson is credited with discovering

• atoms

• protons

• neutrons

• electrons

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

• protons

• neutrons

• electrons

• the nucleus

True or False: Atoms are mostly empty space.

• True

• False

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

• satellites

• orbits

• clouds

• regions