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Arsenic has 5 valence electrons. If it is used as a silicon contaminant, calculate: a) The...

Arsenic has 5 valence electrons. If it is used as a silicon contaminant, calculate: a) The ionization energy.
b) radius of the orbit of the fifth electron in arsenic; take the effective mass of electrons in silicon as m*si= 0.2me.
c) What is the ratio of the ionization energy of the fifth electron to the silicon gap energy?

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