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  4. The energy gaps (Eg) between valence band and conduction band for diamond, silicon and germanium are in the order

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Q. The energy gaps $(E_g)$ between valence band and conduction band for diamond, silicon and germanium are in the order

AIIMSAIIMS 2006The Solid State

Solution:

The energy gaps $\left( E _{ g }\right)$ between valence band and conduction band for diamond, silicon and germanium are in the order
$E _{ g }$ (diamond) $> E _{ g }$ (silicon) $> E _{ g }$ (germanium)
Because diamond is an insulator and non-metallic character decreases down the group.