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C, Si and Ge share a lattice type, yet carbon is an insulator because its:
ABonding electrons lie in the second orbit
BAtoms have only three valence electrons
CCrystal has no covalent bonds
DBonding electrons lie in the fourth orbit
Answer & Solution
Correct answer: A. Bonding electrons lie in the second orbit
Carbon's bonding electrons sit in the second orbit, nearest the nucleus, so freeing them takes the most energy.
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