In metals belonging to the group 2,
the atomic sizes are less as compared to the metals of the group 1 present in
the same period. For example, size of Mg is smaller as compared to Na. This
means that the atoms in group 2 metals are more closely packed as compared to
those belonging to group 1 and the metallic bonds in them are also stronger. Therefore,
the metals of group 2 are harder and denser as compared to metals of group 1.
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