Pentavalent impurities Impurity atoms with 5 valence electrons produce n-type semiconductors by contributing extra electrons. Trivalent impurities Impurity atoms with 3 valence electrons produce p-type semiconductors by producing a  hole  or electron deficiency.he Doping of Semiconductors. The addition of a small percentage of foreign atoms in the regular crystal lattice of silicon or germanium produces dramatic changes in their electrical properties, producing n-type and p-type semiconductors.
Vienna: Annual Weather Averages. July is the hottest month in Vienna with an average temperature of 19Â°C (66Â°F) and the coldest is January at -1Â°C (30Â°F) with the most daily sunshine hours at 9 in July. The wettest month is June with an average of 74mm of rain. Loading weather data.
Virginia Weather > Vienna Weather. Vienna, VA climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 30's. The warmest month of the year is July with an average maximum temperature of 89.10 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 23.90 degrees Fahrenheit.