Chemistry (7th Edition)

Published by Pearson
ISBN 10: 0321943171
ISBN 13: 978-0-32194-317-0

Chapter 2 - Atoms, Molecules, and Ions - Section Problems - Page 73: 98


(a) $_{88}^{220}Ra$ (b) $_{84}^{210}Po$ (c) $_{79}^{197}Au$

Work Step by Step

1. Use a periodic table to find the symbol and the atomic number for each indicated element: (a) Radon: "Ra"; Z = 88 (b) Polonium: "Po"; Z = 84 (c) Gold: "Au"; Z = 79 2. Write the atomic number (Z), on the bottom left, and the mass of the element (A) on the top left of the symbol. ** The mass number is the one that follows the name of the compound: (a) $_{88}^{220}Ra$ (b) $_{84}^{210}Po$ (c) $_{79}^{197}Au$
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