Ch6 Practice Problems KEY

3 Ch. 6 Spring 2024 13. Calculate the wavelength of the radiation released when an electron in a hydrogen atom moves from n = 4 to n = 1. What region of the electromagnetic spectrum does this fall in? 𝜆 = 9.723 𝑥 10 −8 𝑚 ( 10 9 ?? 1 ? ) = 97.2 3 nm UV light 14. Solve. a. What is the wavelength of the light (in nm) that has an energy of 5.5 eV? 𝜆 = ℎ𝑐 𝐸 ?ℎ?𝑡?? = ?. ? × ?? −? ? = ??? ?? b. What type of electromagnetic radiation is this? This is ultraviolet radiation. c. How much energy (in J) would a mole of these photons supply? 𝐸 = ?. ? 𝒙 ?? ? 𝑱/??? = ??? ?𝑱/??? 15. What is the wavelength (in nm) of an electron whose velocity is 1.20 x10 3 m/s? What type of electromagnetic radiation is this? (*Hint: The mass of an electron is 9.01938 x 10 -28 g). 𝜆 = ℎ ?𝑣 = 𝜆 = ℎ 𝑚𝑣 = 6.12 × 10 −7 𝑚 = ??? ?? Visible light - orange

6 Ch. 6 Spring 2024 22. Electron Configuration EXTRA PRACTICE For each of the elements below, write: 1. Orbital diagram (paramagnetic OR diamagnetic) 2. Full electron configuration 3. Noble gas configuration 4. Number of valence electrons 5. Number of core electrons F 1. 2. 1s 2 2s 2 2p 5 3. [He] 2s 2 2p 5 4. 7 5. 2 Mg 2+ 1. 2. 1s 2 2s 2 2p 6 3. [Ne] 4. 8 5. 2 He 1. 2. 1s 2 3. [He] 4. 2 5. 0 V 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3 3. [Ar] 4s 2 3d 3 4. 5. Br - 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 3. [Kr] 4. 8 5. 28 Co 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 7 3. [Ar] 4s 2 3d 7 4. 5. Cu + 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 3. [Ar] 3d 10 4. 5. Cr 2+ 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 3. [Ar] 3d 5 4. 5. N 1. 2. 1s 2 2s 2 2p 3 3. [He] 2s 2 2p 3 4. 5 5. 2 Ge 1. 2. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 2 3. [Ar] 4s 2 3d 10 4p 2 4. 4 5. 28 O 1. 2. 1s 2 2s 2 2p 4 3. [He] 2s 2 2p 4 4. 6 5. 2 Al 3+ 1. 2. 1s 2 2s 2 2p 6 3. [Ne] 4. 8 5. 2 Note: Determining valence electrons for transition metals is more complicated than for representative elements, so you will not be responsible for these.