In what respect does the first member of a group differ from its congeners?
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The first member of the group always differs from its congeners or the other members of the same group.
In group 1 or s block, the first element Lithium (Li) shows some similarities to the second member magnesium of the same group due to the similarities in the radius ratio of the elements or ionic sizes.
Likewise, in group 2 Beryllium (Be) differs from the members of its group. The first element has four electrons in their valence shells and shows the maximum covalency of four whereas other elements show maximum beyond four.
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