Answer
60% $ ^{293}$Nv and 40% $ ^{295}$Nv.
Work Step by Step
There are 20 total spheres. 12 are red, which is $ ^{293}$Nv. 12$\div$20 = 60%. The remaining 40% are $ ^{295}$Nv.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 73: 2.2a
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