Answer
A = 31
Work Step by Step
Atomic number (Z) of Phosphorus (P) = 15 (Refer Periodic Table)
Number of neutrons = 16 (Given)
Mass number (A) = Number of protons (Atomic number) + Number of neutrons = 15+16 = 31
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 2 - Chemical Compounds - Problem Solving Practice 2.3 - Page 51: a
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