Trends in Atomic Radius and Ionic Radius

Chemistry

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Define Metallic Radius

The metallic radius is the radius of an atom joined by metallic bond. The metallic radius is half of the distance between the nuclei of two adjacent atoms in the metallic cluster.

Metallic radius for the given diagram is 180 pm.

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Atomic Size Trend Across the Period

Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron cause of the coulombic law. Thus, electrons are pulled towards the nucleus, resulting in a smaller radius.

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Atomic Size Trend Down the Group

The number of energy levels increases moving down a group as the number of electrons increases. As a result, the distance between the nucleus and the outermost orbital increases and so the atomic radius increases. 

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Trend of atomic size in periodic table

The atomic radius of an element is a measure of the size of its atoms. It represents the mean distance from the nucleus to the outermost boundary of the surrounding cloud of electrons. Atomic radii vary in a predictable manner across the periodic table.

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