Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Which one of the following ionic species has the greatest proton affinity to form stable compound?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
In going from left to right across a period in the periodic table, the basicity ( i . e . proton affinity) decreases as the electronegativity of the atom possessing the lone pair of electrons increases. Hence basicity of 
is higher than F. In moving down a group, as the atomic mass increases, basicity decreases. Hence 
is more basic than 
and 
is more basic than HS. Hence among the given ionic species, 
has maximum proton afinity.
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