Chemistry Chap. 3: Structure of Atom (Def. & Review)

Positively charged subatomic particles.

• proton

• electron

• neutron

• nucleus

Subatomic particles with no charge but with a mass nearly equal to that of a proton.

• electrons

• quarks

• neutrons

• isotopes

This person suggested that the world was made of two things, empty space and tiny particles called atoms. He thought there were different types of atoms.

• Democritus

• Aristotle

• Ernest Rutherford

• Robert Millikan

Atoms with the same number of protons but different numbers of neutrons.

• quarks

• molecule

• isotopes

• neutrons

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NGSS.HS-PS1-8

NGSS.HS-PS1-4

Each end of a cathode-ray tube contains a metal piece called an:

• cathode

• anode

• electrode

• all of the above

Negatively charged subatomic particles.

• electrons

• protons

• neutrons

• nucleus

Although protons and neutrons are extremely small, physicist believe they are composed of yet smaller sub-nuclear particles called:

• antiparticles

• quarks

• isotopes

• electrodes

Tiny central core of an atom composed of the protons and neutrons.

• control center

• nucleus

• neutrons

• powerhouse of atom

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NGSS.HS-PS1-8

Scientist who was in charge of the gold foil experiment.

• Robert Millikan

• Ernest Rutherford

• J.J. Thomson

• John Dalton

The positive electrode in a cathode-ray tube is called:

• anode

• cathode

• electrode

• quark