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When small non-metal atoms such as boron or carbon occupy the interstitial sites of a transition metal lattice, the resulting interstitial compound is

1. more ductile
2. less ductile
3. less malleable
4. harder than the pure metal

Correct answer: harder than the pure metal

Solution

Interstitial atoms fill the gaps between metal atoms and resist the sliding of metal layers, so the chief characteristic gained is increased hardness (along with reduced ductility/malleability).

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