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An n-type semiconductor can be formed if silicon is doped with an element that :


A) has more valence electrons than silicon.
B) has fewer valence electrons than silicon.
C) belongs to group 14 of the modern periodic table.
D) belongs to group 13 of the modern periodic table.

E) C) and D)
F) A) and B)

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Which substance has the lowest vapor pressure ?


A) CClF 3
B) propane (C3H8)
C) ethane (C2H6)
D) HCN

E) A) and B)
F) A) and C)

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