Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 4 - Atomic Structure - Standardized Test Prep: 6

Answer

Both statements are false.

Work Step by Step

1) False. 27 is the atomic mass of Al, not its atomic number. Al's atomic number is 13, therefore, it has 13 protons and 13 electrons 2) False. Again, 27 is the atomic mass of Al, not its mass number. Mass number = number of protons + number of neutrons.
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