Why the elements of second row (first short period) show a number of differences in properties from other members of their respe

The difference in the properties of the first member of a group from those of the other members is due to (i) smaller size of the atom (ii) presence of one inner shell of only two electrons and (iii) absence of a orbitals .

Why the elements of second row (first short period) show a number of differences in properties from other members of their respective families ?

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