Answer:
The ionisation enthalpies of
alkali metals are relatively low as they have large size, i.e., the outermost
electron is far from the nucleus and can be easily removed. The ionisation enthalpy
decreases from Li to Cs as the size increases from top to bottom.
The ionisation enthalpies of
halogens are very high. This indicates that the halogens have a little tendency
to lose electron. This is due to high effective nuclear charge.
However, the ionisation enthalpies
decrease from F to I as the atomic size increases.
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