Concept explainers
Interpretation:
The change in atomic radius needs to be related to the change in atomic structure that takes place in the periodic table.
Concept introduction:
Atomic radius is used for distance between the nucleus and outermost shell of electrons of the atomic and ionic particle.

Answer to Problem 13STP
In a period, atomic radii decreases on moving from left to right.
Explanation of Solution
In a period, on moving from left to right atomic radii decreases. On moving from left to right across in a period, electrons are added to the outermost orbital and protons are added to the nucleus. Protons increases the positive charge in the nucleus and thus nucleus pull the electrons very tight.
On moving left to right across in a period electrons are added to the outermost orbital and protons are added to the nucleus thus in a period from left to right atomic radii decreases.
Chapter 7 Solutions
Chemistry: Matter and Change
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