Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 2 - Section 2.1 - From Atoms to Molecules - Check Your Progress - Page 25: 2

Answer

$^{40}$Ca has 20 neutrons whereas $^{48}$Ca has 28 neutrons.

Work Step by Step

$^{40}$Ca has 20 neutrons whereas $^{48}$Ca has 28 neutrons. We determine this because we know that the superscript preceding the atomic symbol of calcium (Ca) is called the mass number, which is the number of protons plus the number of neutrons. If we take this mass number and subtract the atomic number, which is the number of protons in that element, then we get the number of neutrons in that particular isotope.
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