General, Organic, & Biological Chemistry 3rd Edition

Published by McGraw-Hill Education
ISBN 10: 0-07351-124-2
ISBN 13: 978-0-07351-124-5

Chapter 2 - Atoms and the Periodic Table - Problems - Page 43: 2.10

Answer

See the explanation

Work Step by Step

a) We have: - $4$ protons, $5$ neutrons b) The atomic number is equal to the number of protons: $4$ The mass number is the sum between the number of protons and the number of neutrons: $4+5=9$. c) The element is beryllium.
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