An example of metal excess defects is
Agcl
Nacl
Cscl
Fes
Increased ______ causes the carbon atoms in diamond to split.
Thermal energy
wind energy
kinetic energy
vibrational energy
Which crystal is not made up of ions?
covalent network crystals
ion crystal
both a and b
none of these
Which of the following allows light to pass through it?
diamond
coal
lead
graphite
At what temperature the vibrational energy of the contents of the diamond increase?
4000oC
6000oC
5000oC
7000oC
How many carbon atoms surrounded each carbon atom in diamond structure?
8
2
4
6
Which bonds connect the carbon atoms in a diamond crystal?
valance bond
covalent bond
coordinate bond
ionic bond
At what temperature diamond can be vapourized?
1000o C
400oC
Which of the following has its atoms connected by valence bonds?
sodium chloride
Which of the following has 1.54 Ao bond length throughout the crystal?
silicon carbide
