Answer
19 protons, 21 neutrons
Work Step by Step
Atomic number of the isotope $^{40}_{19}K$ = 19 = $Z$
Mass number of $^{40}_{19}N$ = 40 = $A$
So, number of protons = Atomic number = 19
Number of neutrons = $A - Z = 40-19 $ = 21
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic - Page 80: 54a
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