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The first element of group different for...

The first element of group different form its congeners, i.e. other members of the group in many ways. These differences may be due to the following:
i. Small size of atom and ion.
ii. High electronegativity.
iii. Non-availability of low lying d-orbitals.
The first element of a group shows resemblance with the second element of the adjacent group on the right. This is known as diagonal relationship.
In dry air, lithium and sodium react to give

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