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Unformatted text preview: ? This hybridization of the s and p orbitals is the origin of the Lewis Octet principle in chemistry – the idea that each atom wants to have or share a total of 8 electrons. Strong covalent bonds are formed in semiconductors like Si when each atom ends up being able to share a total of 8 electrons. http://en.wikipedia.org/wiki/Octet_rule 3) Kasap Problem 4.4 – in this problem, a “valency of III” means that the atom has 3 electrons in its outermost s and p orbitals. Similarly, “a valency of V” means that it has 5. Start with the idea from the problem we did for Si on HW 6 – the sp3 orbitals will form an equal number of bonding and antibonding orbitals and we need to fill them up with the electrons from the atoms. 4) Kasap 4.7 5) Kasap Read example 4.9 (p. 319). a. Explain how this calculated velocity relates to the picture of electrical conductivity we discussed in Chapter 2. How is this velocity related to the drift velocity? b. What is the drift velocity if we apply 1 V across a 1 cm long Cu wire ne...
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 Spring '14

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