Which one of the following is a good conductor of electricity?
Diamond
Graphite
Silicon
Amorphous carbon
Buckminster-fullerene is a variety of
boron
carbon
ammonia
fluorine
B.
carbon
A recently discovered family of carbon allotropes is buckminster fullerene which was named after R, buckminsterfuller. The most common fullerene has the formula C60 and contains hexagonal and pentagonal rings of carbon atoms.
Doping of silicon with boron leads to
n-type semiconductor
p-type semiconductor
superconductor
insulator
The electronic configuration of an element C is 1s2, 2s2, 2p6. The formula of substance containing only C will be
C8
C4
C2
C
C14 is
a natural non-radioactive isotope
an artificial non-radioactive isotope
an artificial radioactive isotope
a natural radioactive isotope