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Ch.7 - Periodic Properties of the Elements
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All textbooksBrown 14th EditionCh.7 - Periodic Properties of the ElementsProblem 108b

Chapter 7, Problem 108b

We will see in Chapter 12 that semiconductors are materials that conduct electricity better than nonmetals but not as well as metals. The only two elements in the periodic table that are technologically useful semiconductors are silicon and germanium. Integrated circuits in computer chips today are based on silicon. Compound semiconductors are also used in the electronics industry. Examples are gallium arsenide, GaAs; gallium phosphide, GaP; cadmium sulfide, CdS; and cadmium selenide, CdSe. (b) Workers in the semiconductor industry refer to 'II–VI' and 'III–V' materials, using Roman numerals. Can you identify which compound semiconductors are II–VI and which are III–V?

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Hi everyone here we have a question to ask that silicon and germanium are the only two elements that are practically useful semiconductors. However, compound semiconductors that are made from two or more elements are also used. Some examples are cadmium cell inside cadmium sulfide, gallium, phosphate hide and gallium arsenide. The semiconductor industry classifies these compounds as semiconductors into 26 and 35 materials identify which compounds are in each category. So 35 materials are going to be in Group three A. And five A. And Group 26 materials are going to be in Group two B. And six A. So now let's look at each of our elements. So we have cadmium sell and I'd cadmium is in to be cell Inside Is in six a. Which makes this a 26 material. We have cadmium sulfide, cadmium again is in to be Sulfide is in six a. So that makes this a 26 material gallium phosphate fit galleon Is in three a. Phosphorus Is in five a. That makes this a 35 material gallium arsenide, gallium Is in Group three A. Arsenic Is in Group five A. That makes this a 35 material. And these are our answers. Thank you for watching. Bye.
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