Answer:
The elements of group 1 have the tendency to lose the valence
electron easily and this tendency increases from Li to Cs as the value of
ionisation enthalpy decreases from Li to Cs and thereby chemical activity
increases. The elements of group 17 have the tendency to gain one more electron
to saturate the outermost shell. This tendency decreases from F to \[I\]as
their electrode potentials decrease from F to \[I\] and thereby their reactivity
decreases, i.e., \[F\text{ }>\text{ }Cl\text{ }>\text{ }Br\text{
}>\text{ }I\].
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