1. Chapter 6 Electronic Structure and the Periodic Table

2. c= λf λ = c/f f = c/λ c = speed of light, 2.998 x 10 8 m/s λ = wavelength, m f = frequency, Hertz, Hz

3. Problem Microwaves have a wavelength of 1.000 cm. Calculate their frequency in Hz. 1.000 cm = 1.000 x 10 -2 m f = (2.998 x 10 8 m/s)/1.000 x 10 -2 m = 2.998 x 10 10 Hz

4. Problem Calculate the wavelength of a band on your AM radio with a frequency of 4.56 x 10 5 Hz. λ = (2.998 x 10 8 m/s)/(4.56 x 10 5 Hz) = 657 m

5. Wave

6. Energy E = hc/λ E = hf E = energy, Joules, J c = speed of sound, 2.998 x 10 8 m/s h = Planck’s constant, 6.626 x 10 -34 J*s

7. Problem Calculate the the energy of microwaves in Joules, using the frequency 2.998 x 10 10 Hz. E = hf E = (6.626 x 10 -34 J*s)(2.998 x 10 10 Hz) = 1.986 x 10 -23 J

8. Problem Calculate the energy in Joules of an AM radio wave having a wavelength of 657 m. E = hc/λ E = (6.626 x 10 -34 J*s)(2.998 x 10 8 m/s)/657 m = 3.0 x 10 -28 J

9. Quantum Numbers

10. Principle Quantum Number  Symbolized by n  Indicates the main energy level occupied by the electron  Values are integers starting with 1

11. Angular Momentum Quantum Number  Symbolized by l  Indicates shape  Values are 0, 1, 2, 3 spdf 0123

12. Magnetic Quantum Number  Symbolized by m l  Indicates the orientation of the orbital around the nucleus  Values are l,…, +1, 0, -1,..., -l

13. Spin Quantum Number  Symbolized by m s  Indicates the fundamental spin states of an electron in an orbital  Values are + ½ and -1/2

14. Review  Electron Configurations  Orbital Diagrams  Noble Gas Configurations  Periodic trends  Atomic Radius  Ionization Energy  Electronegativty

15. Periodic Trends  Atomic Radius  Decreases across periodic table from left to right  Increases down a group  Ionization Energy  Increases across periodic table from left to right  Decreases down a group  Electronegativity  Increases across periodic table from left to right  Decreases down a group

16. Ionic Radius  Ionic Radii increase down a group.  Cations are smaller than their corresponding atoms.  Anions are larger than their corresponding atoms.

17. Chapter 6 Assignment Summary problem page 158 Chapter Review p. 159 2, 5, 10, 30, 32, 34, 34, 38, 40