Explain how the atomic radii are a periodic property.
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Due to the below mentioned points, atomic radius is a period property:
Variation in a group: As we move from top to bottom in a group, with the increase in atomic number, the atomic radius of elements increases. Due to the increase in shell number, the attraction of the nucleus for the electrons decreases. Therefore, along with the group, the atomic radius increases.
Variation in periods: The atomic radius decreases when we move from left to right in a period. Again, moving left to right in a period, the nuclear charge rises by one unit in each following element. However, the number of shells remains the same, which is why the electrons are strongly attracted by the nucleus, and the atomic radius decreases along the period.