The conditions for the formation of ionic bonds are:

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a low ionization energy of the electropositive ion

a high electron affinity of the electro negative ion

a high lattice energy of the ionic compound formed

all of the above

answer is D.

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Detailed Solution

Conceptual

Ionic bond form between a non-metal and a metal. In this bond, there is an electron transfer from metal to non-metal. So, a low ionization energy of the electropositive ion (metal) and a high electron affinity of the electronegative ion (non-metal) readily forms the ionic bond. A high lattice energy corresponds that the bond between metal and non-metal is strong.

Hence, (d) is the correct answer.

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