Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 17 - Radioactivity and Nuclear Chemistry - Exercises - Problems - Page 637: 54

Answer

The nuclide has 86 protons and 133 neutrons.

Work Step by Step

The lower number is the atomic number, which represents the number of protons. The number of neutrons is given by the mass number minus the atomic number: $219-86=133$
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