The two crystalline allotropes of carbon are:
Amorphous carbon and diamond.
Amorphous carbon and graphite.
Coke and diamond.
Diamond and graphite.
In the crystal of diamond, each carbon atom is covalently bonded to ... other carbon atoms arranged tetrahedrally around it.
One.
Four.
Two.
Three.
Diamond is the hardest natural substance ever known due to:
The strength, uniformity and complexity of metallic bonds in its crystal lattice.
The strength, uniformity and complexity of ionic bonds in its crystal lattice.
The covalent bonds in its crystal lattice.
The strength, uniformity and complexity of covalent bonds in its crystal lattice.
The outer electronic configuration for group 14 elements is:
ns¹np³.
ns²np⁴.
ns²np².
ns²np³.
The allotropes of carbon are:
All are correct.
Amorphous carbon.
Diamond.
Graphite.
