Understanding Atomic Theory

Who is considered the first person to begin the search for a description of matter?

• Democritus

• Aristotle

• John Dalton

• Niels Bohr

What did Democritus believe was the smallest piece of matter?

• Atom

• Electron

• Neutron

• Automose

According to early atomic theory, what determined the properties of a substance?

• The color of the atom

• The weight of the atom

• The shape of the atom

• The size of the atom

What model did J.J. Thompson propose for the atom?

• Saturn model

• Planetary model

• Plum pudding model

• Solar system model

What subatomic particle did James Chadwick discover?

• Neutron

• Photon

• Electron

• Proton

What did Ernest Rutherford discover about the atom?

• It is mostly empty space

• It is completely solid

• It is always moving

• It is flat

Which model of the atom did Niels Bohr propose?

• Cookie model

• Plum pudding model

• Planetary model

• Quantum mechanical model

What did Erwin Schrodinger use to describe the location of electrons?

• A simple guess

• A microscope

• A physical map

• A mathematical equation

What did the experiments of John Dalton in the early 1800s support?

• The theory of relativity

• The existence of air and fire

• The theory of evolution

• The atomic theory

What did Aristotle believe the world was made of?

• Atoms and molecules

• Tiny particles

• Invisible forces

• Air, water, fire, and earth