First slide
Classification of Metals, semiconductors and insulators
Question

The nature  of binding  for  a crystal  with  alternate  and evenly spaced positive and negative ions is

Moderate
Solution

Ionic bonds come into being when atoms that have low ionization energies, and hence lose electrons rapidly, interact with other atoms that acquire excess electrons. The former atoms gives up electrons to the latter and they there upon become positive and negative ions respectively.

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