Question

which group in the periodic table contains the three elements with the highest electrical conductivities?
a) group 12
b) group 8
c) group 11
d) group 7
question 13 (5 points)
a silicon (si) wafer is being fabricated by doping with boron (b) atoms. which type of semiconductor is this?
a) n - type
b) intrinsic and n - type
c) intrinsic

Explanation:

• For the first question: Group 11 contains copper (Cu), silver (Ag), and gold (Au), which are among the best electrical conductors.
• For the second question: Boron is a p - type dopant. When silicon (a group 14 element) is doped with boron (a group 13 element), it creates holes (positive charge carriers), making it a p - type semiconductor.

Answer:

1. C. Group 11
2. (Since the options provided in the second question do not include the correct "p - type", but if we assume there is an error in the options and based on the doping concept): None of the given options (A, B, C) are correct. The correct type should be p - type. If we have to choose from the given options, there is a mistake in the question setup as boron doping gives p - type, not N - type (A), not a combination of intrinsic and N - type (B), and not intrinsic (C).