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Briefly explain how impurities are selected for doping in group 14 semiconductors.

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

Which of the following statements about acidic water is true? a. acid has no effect on the h, o molecules. b. the solution contains a larger number of oh ions than h, o ions. c. the solution contains a larger number of h, o ions than qh ions. d. the solution contains an equal number of h, o ions and oh ions. none of the above e.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.