# Chapter 6 - The Periodic Table - 6.3 Periodic Trends - 6.3 Lesson Check - Page 182: 24

Na>Al>S>Cl

#### Work Step by Step

Atomic size generally increases when moving down a group and decreases when moving across a period from left to right. In this problem, all the elements involved are in the same period. This is, therefore, a periodic trend (referring to the fact that it occurs in a period, or row of the periodic table). The elements on the left side are larger than those on the right side.

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