Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 361: 8.42

Answer

The decreasing order of the atomic radius is, Li$\gt$ Be$\gt$ B$\gt$C$\gt$N$\gt$O$\gt$F$\gt$ Ne.

Work Step by Step

The second-period elements are Li, Be, B, C, N, O, F, Ne with atomic numbers 3, 4, 5, 6, 7, 8, 9, 10 respectively. As the atomic number increases nuclear charge also increases. Here the electrons are added to the same shell, which is the second shell. The atomic radius decreases as the atomic number increases. As the nuclear charge increases electrons are firmly held by the nucleus and hence atomic radius decreases. The decreasing order of atomic radius is, Li$\gt$ Be$\gt$ B$\gt$C$\gt$N$\gt$O$\gt$F$\gt$ Ne.
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