Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 7 - Periodic Properties of the Elements - Exercises: 7.10

Answer

"Eka-manganese" refers to Technetium (Tc).

Work Step by Step

The prefix "-eka," as mentioned, is used by Mendeleev to predict the unknown element that is one row below the mentioned element, as in the case of "eka-silicon." Therefore, to find the element "eka-manganese," we would look at the periodic table and identify the element that is below manganese. That element is Technetium (Tc).
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