Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 2 - Atoms, Molecules, and Ions - Questions & Problems - Page 68: 2.9

Answer

Please see the work below.

Work Step by Step

We know that helium has atomic number 2 and mass number 4 which shows that it has two protons and two electrons and zero electrons. Atomic number is the number of protons in an atom and a stable atom has equal number of protons and electrons.
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