Answer
Before
Work Step by Step
We know that electrons actually start entering the 4th energy level before the 3d block is completely full. Thus, "as soon as" should be replaced with "before" in this case.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240e: 112c
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