Who was the first person to propose the idea of an atom?

• JJ Thompson

• Democritus

• Aristotle

• John Dalton

According to Aristotle, what were the five basic elements that made up matter?

• Earth, Water, Air, Fire, and Wood

• Earth, Water, Air, Fire, and Spirit

• Earth, Water, Air, Fire, and Metal

• Earth, Water, Air, Fire, and Ether

Which of the following is NOT one of John Dalton's postulates?

• All atoms of the same element are identical

• Atoms can be created or destroyed

• All matter is composed of atoms

• Chemical reactions occur when atoms are rearranged

What did JJ Thompson discover about the atom?

• It contains a positively charged nucleus

• It is indivisible

• It is made up of five basic elements

• It contains negatively charged electrons

What device did JJ Thompson use to discover the electron?

• Gold foil

• Cathode ray tube

• Mass spectrometer

• Particle accelerator

What was the main conclusion from Rutherford's gold foil experiment?

• Electrons are embedded within the atom

• Atoms are mostly empty space with a dense, positively charged center

• Atoms are indivisible

• Atoms are made up of five basic elements

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NGSS.HS-PS1-8

In Rutherford's model, where are the electrons located?

• In the nucleus

• Embedded within the atom

• In discrete energy levels

• Circling around the outside of the central particle

According to Niels Bohr, how do electrons travel around the atom?

• In random paths

• In a dense nucleus

• In discrete energy levels

• Embedded within the atom

What principle did Werner Heisenberg propose about electrons?

• You cannot know both the speed and position of an electron at the same time

• Electrons can act like waves

• Electrons are embedded within the atom

• Electrons are indivisible

Who discovered the neutron?

• Erwin Schrodinger

• James Chadwick

• Niels Bohr

• Louis de Broglie