Atomic Theory and Atomic Structure: Unit Review

Front

Who is known for the discovery of the electron through the Cathode-Ray Tube Experiment?

Back

J.J. Thomson

Front

What experiment did Ernest Rutherford conduct to discover the nucleus of the atom?

Back

Gold Foil Experiment

Front

In a neutral atom, what two subatomic particles are always equal in number?

Back

Electrons and protons

Front

What role do protons play in determining the identity of an element?

Back

Protons give the atom its identity as an element.

Front

What is the electrical charge of an electron?

Back

Negative

Front

What is the mass of a proton compared to an electron?

Back

A proton is approximately 1836 times more massive than an electron.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the significance of neutrons in the nucleus of an atom?

Back

Neutrons contribute to the mass of the atom and help stabilize the nucleus.

Tags

NGSS.HS-PS1-8

Front

What is the overall charge of a neutral atom?

Back

Zero, because the number of protons equals the number of electrons.

Tags

NGSS.HS-PS1-7

Front

What is the difference between isotopes of an element?

Back

Isotopes have the same number of protons but different numbers of neutrons.