Answer
There would be fewer alpha particles deflected back.
Work Step by Step
Because beryllium has a lower density than gold, there is more empty space, and thus more space for particles to pass through without being deflected back.
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 75: 2.18a
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