Chemistry (7th Edition)

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

Chapter 2 - Atoms, Molecules, and Ions - Worked Example - Page 51: 8



Work Step by Step

The number of protons is equal to the atomic number. According to the periodic table, the element with atomic number equal to 24 is Chromium, and it has "Cr" as its symbol. Now, we need to determine the mass number. It is the sum of the number of protons and the number of neutrons: $24 + 28$ = $52$ Now, write the symbol for the element, making the mass number super-scripted and the atomic number sub-scripted. They are both on the left side of the symbol. $_{24}^{52}Cr$
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