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UP CPMTUP CPMT 2015The p-Block Elements - Part2
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Solution:
The order of reactivity is F>Cl>Br>I It is due to the following factors :
(i) As atomic size increases the attraction for an additional electron by the nucleus becomes less. Thus, reactivity decreases.
(ii) Due to decrease in electronegativity from F to I, the bond between halogen and other elements becomes weaker and weaker. Thus, fluorides are most stable while iodides are least.