Electron Configuration
and Waves
1. What are valance electrons? The outermost electrons, and they are used for
bonding
2. What are core electrons? The innermost electrons, and they are not used for
bonding
3. What is the photoelectric effect? Certain colors of light would cause electrons to
be emitted from metal, and certain colors of light were never able to cause the loss
of electrons.
4. In order for an electron to go to a higher level it must absorb
energy.
5. In order for an electron to go to a lower level it must emit
energy.
6. What are the electron configurations for the following elements?
A. Be 1s22s2
B. F 1s22s22p5
C. Si 1s22s22p63s23p2
D. Ti 1s22s22p63s23p64s23d2
E. Zn 1s22s22p63s23p64s23d10
Define the following terms
7. Wavelength the distance between the crests of the wave.
8. Frequency this tells us how fast the wave oscillates up and down
9. Amplitude height if the wave from its origin to its peak.
10. Planck’s constant 6.6262 x 10-34 Js
11. The speed of light 3.00 x 108 m/s
12. If there is a high frequency what kind of wavelength is present?
short
13. If there is a low frequency what kind of wavelength is present?
long
14. Find the wavelength and energy if the frequency is 102.7 MHz.
h = 6.626 x 10 –34 J s
c = 
C = 3.00 x 108 m/s
1 MHz = 1,000,000 Hz
E = h
Hz = s-1
A) Find the wavelength of the radio wave.
3.00 x 108 m x
sec
=
2.92 m
sec
1.027 x 108
B) Find the energy in Joules for the radio station.
6.626 x 10 –34 J s
x
1.027 x 108 =
6.80 x 10-26 J
sec
15. Find the wavelength and energy if the frequency is 93.7 MHz.
Given:
A) Find the wavelength of the radio wave.
3.00 x 108 m x
sec
=
7
sec
9.37 x 10
B) Find the energy in Joules for the radio station.
6.626 x 10 –34 J s
x
9.37 x 107
=
sec
3.20 m
6.208 x 10-26 J
16. Find the wavelength and energy if the frequency is 4.6875 x 1014.
A) Find the wavelength of the red light.
3.00 x 108 m x
sec
sec
4.6875 x 1014
=
B) Find the energy in Joules for red light.
6.626 x 10 –34 J s
x
4.6875 x 1014 =
sec
6.4 x 10-7 m
3.11 x 10-19 J
17. Find the wavelength and energy if the frequency is 6.67 x 1014.
A) Find the wavelength of the green light.
3.00 x 108 m x
sec
sec
6.67 x 1014
B) Find the energy in Joules for green light.
6.626 x 10 –34 J s
x
6.67 x 1014
sec
=
4.49 x 10-7 m
=
4.42 x 10-19 J