alleryDiamond conducts heat well but does NOT conduct electricity because:
AIt has free electrons in standard practice
BIt is a metal in the standard view
CAll valence electrons are used in covalent bonds
DIt has positive ions only
Answer & Solution
Correct answer: C. All valence electrons are used in covalent bonds
1. Each carbon atom in diamond is bonded to four neighbours in a 3D lattice.
2. All four valence electrons are tied up in C-C single bonds.
3. There are no free electrons available to carry current.
4. Hence diamond is a poor electrical conductor.
5. Heat still travels well through the rigid covalent network as phonons.
_Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_
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