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Physical Science, 5/e
Bill Tillery, Arizona State University
Atomic Structure

True or False



1

An element is a pure substance that cannot be broken down into anything simpler by physical or chemical means.
A)TRUE
B)FALSE
2

J.J. Thomson discovered that cathode rays were really a stream of electrons.
A)TRUE
B)FALSE
3

The atomic number of an element is the total number of protons and neutrons in the nucleus.
A)TRUE
B)FALSE
4

An electron moves from one allowed orbit to another only when it absorbs or emits a fixed amount of energy.
A)TRUE
B)FALSE
5

Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom.
A)TRUE
B)FALSE








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