Question

The most favourable conditions for electrovalent bonding are:

• A. Low ionisation enthalpy of one atom and high electron affinity of the other atom
• B. High ionisation potential and high electron affinity of both the atoms
• C. Low ionisation enthalpy and low electron affinity of both the atoms
• D. High ionisation enthalpy of one atom and low electron affinity of the other atom

Answer 1

The correct option is A Low ionisation enthalpy of one atom and high electron affinity of the other atom

The formation of electrovalent bond depends on two factors: Ionization enthalpy $\left(IE\right)$ & Electron affinity $\left(EA\right)$.
Lesser the value of ionization enthalpy, greater is the tendency of the atom to form a cation by removal of electrons.
Similarly, higher the value of electron affinity, more is the tendency of the atom to form an anion by accepting electrons.
Hence, for any electrovalent bond formation one atom should have low IE and other atom must have high EA.