Question

As we move from left to right, the electronegativity increases. An atom which is highly electronegative has:

• A. large size
• B. low electron affinity
• C. high ionisation enthalpy
• D. low chemical reactivity.

Answer 1

Answer: (C)

high ionisation enthalpy

As we move from left to right, the electronegativity increases. An atom which is highly electronegative has high ionisation enthalpy. It is difficult to remove an electron from a highly electronegative element. Thus highly electronegative halogens have high ionisation enthalpy whereas highly electropositive alkali metals have least ionisation enthalpy.