Which one of the following is a good conductor of electricity?
Diamond
Graphite
Silicon
Amorphous carbon
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
D.
a natural radioactive isotope
Carbon has three important isotopes C12, C13 and C14. C14 is formed is traces in the atmosphere by cosmic bombardment of nitrogen.
7N14 + 0n1 → 6C14 + 1H1
C14 is a natural radioactive isotope.