Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 6 - The Periodic Table - 6 Assessment - Page 186: 26

Answer

Mendeleev left spaces in the periodic table because he believed there would be more elements to fill the spaces he had left.

Work Step by Step

He knew certain elements went with other elements but that they did not line up. He thusly made predictions of where these unknown elements would be and their properties based off that.
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