Give the trends in metallic radii of alkali, alkaline earth and transition metals of fourth, fifth and sixth periods with proper illustration.

The metallic radii of elements vary across different groups and periods in the periodic table. The trends in metallic radii for alkali metals, alkaline earth metals, and transition metals in the fourth, fifth, and sixth periods are as follows:

1. Alkali Metals (Group 1: Li, Na, K, Rb, Cs, Fr)

• Trend: Metallic radius increases down the group.
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