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Band theory predicts that magnesium is an insulator. However, in practice it acts as a conductor due to

Options

  1. Apresence of filled 3s – orbital
  2. Boverlap of filled 2p and filed 3s- orbital
  3. Coverlap of filled 3s and empty 3p-orbital
  4. Dpresence of unfilled 3p –orbital

Correct answer

C. overlap of filled 3s and empty 3p-orbital

Step-by-step solution

The electronic configuration of Mg is 1 s 2 , 2 s 2 , 2 p 6 , 3 s 2 , 3 p 0 In it 3s – orbital is completely filed and 3p-orbital is empty. There is very small energy difference between 3s and 3p – orbitals. Thus, they overlap and make the Mg a conductor. Band model of Mg

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