Answer
b. The existence of unpaired electrons in the valence shell.
Work Step by Step
The existence of unpaired valence electrons is what makes an atom reactive, because the atom is able to bond or react with other atoms.
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 2 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 42: 3
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