Answer:
(a) The element 5 has highest first
ionisation enthalpy and positive electron gain enthalpy is the member of inert
gases. It is least reactive.
(b) The element 2
has the least first ionization enthalpy and low electron gain enthalpy is
highly electropositive and hence, most reactive metal.
(c) The
element 3 has high first ionisation enthalpy and highest electron gain enthalpy
is highly electronegative and hence most reactive non-metal (probably halogen).
(d) The
element 4 has comparatively high ionisation enthalpy and high electron gain
enthalpy. It seems to be a higher member of halogen group (probably iodine)
which is least reactive non-metal.
(e) The element 6 has
comparatively low first ionisation enthalpy and low electron gain enthalpy. It
is an alkaline earth metal. It forms halide, \[M{{X}_{2}}\].
(f) The element first has low first ionisation enthalpy and
a very high second ionisation enthalpy seems to be an alkali metal. It forms
halide, MX.
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