Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 2 - Section 2.3 - Atomic Number, Mass Number, and Isotopes - Checkpoint - Page 49: 2.3.1



Work Step by Step

The number of neutrons in an atom can be determined if you are given the mass number of the atom. In this case, we are dealing with an atom of nickel with a mass number given as 60. The atomic number of nickel is 28, which can be found on the periodic table. The mass number is the number of protons and neutrons in the nucleus of the atom. The atomic number is the number of protons in the nucleus of an atom. If we subtract the atomic number from the mass number, we will get the number of neutrons in that atom's nucleus, which is given by the following formula: Number of neutrons = mass number (A) - atomic number (Z) We can plug in the numbers for A and Z: Number of neutrons = 60 - 28 We do the subtraction to get: Number of neutrons = 32
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