The degree of metallic character and types of bonding vary in similar ways in both groups.
The term "metallic character" describes how reactive metal is. Metals have low ionization energies, which suggests that they frequently lose electrons during chemical processes. Metal atoms within a compound exhibit comparatively weak electron attraction, as shown by their weak electronegativities. The most reactive metals would be found in the lower-left corner of the periodic table, as shown by the trend summary in the image below.
Cesium, which does not exist as a free element in nature, is the most reactive metal. It interacts violently with water and will spontaneously catch fire in the air. In the alkali metal family, francium is located below cesium, but because it is so uncommon, few studies have been done on it.
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