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Ionic bonds are formed most easily between elements with:
AComparatively low ionisation enthalpy and comparatively high negative electron-gain enthalpy
BEqual electronegativities
CBoth being non-metals
DHigh ionisation enthalpy and low electron-gain enthalpy
Answer & Solution
Correct answer: A. Comparatively low ionisation enthalpy and comparatively high negative electron-gain enthalpy
Cation formation requires low IE; anion formation requires high (negative) electron-gain enthalpy. So **low IE element + high negative ΔₑₐH element → easy ionic bond**.
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