Answer
Theory
Work Step by Step
The statement "The reactivity of elements depends on the arrangement of their electrons" is a THEORY, as it hasn't been yet proven with complete certainty but is supported by a significant body of evidence.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 1 - Sections 1.1-1.8 - Exercises - Problems by Topic - Page 37: 34d
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