Unit 8 LPChem:Wz:1415 Name Period Date Rutherford-Bohr Model of the Atom – Ch. 4 1. Bohr is said to have “quantized” Rutherford’s model of the atom. Why did Bohr feel that Rutherford’s model could not be correct unless electron energies were quantized? 2. The diagram below contains five options for electron location in the planetary model (labeled A-E). Which of the five electrons locations would be “allowed” and which “forbidden” according to the two scientists? (Hint: they agree about most, but not all of the electron locations.) 3. Two different elements will require different colors (energies) of light to facilitate electron transitions even if both elements contain the same number of electrons. What difference between the allowed electron orbits of the elements causes this? 4. What is a photon? 5. If an electron moves from position C to position B on the diagram above, is a photon emitted or absorbed? 6. If an electron moves from position B to position E on the diagram above, is a photon emitted or absorbed? 7. In #5 and #6 which transition involves the highest energy photon? Why? 8. List the colors of visible light in order from greatest energy to least energy. 9. Which color of visible light has the highest frequency? 10. Most FM radio stations have frequencies of 90-100 MHz. AM radio stations have frequencies from 500 to 1600 kHz. Which type of radio wave has more energy? “allowed orbits” “forbidden orbits” Rutherford Bohr

Rutherford-Bohr Model of the Atom Ch. 4 - LPHS Chemistry · Rutherford-Bohr Model of the Atom – Ch. 4 1. Bohr is said to have “quantized” Rutherford’s model of the atom. Why

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Page 1: Rutherford-Bohr Model of the Atom Ch. 4 - LPHS Chemistry · Rutherford-Bohr Model of the Atom – Ch. 4 1. Bohr is said to have “quantized” Rutherford’s model of the atom. Why

Unit 8 LPChem:Wz:1415

Name Period Date

Rutherford-Bohr Model of the Atom – Ch. 4

1. Bohr is said to have “quantized” Rutherford’s model of the atom. Why did Bohr feel that Rutherford’s model could not be correct unless electron energies were quantized?

2. The diagram below contains five options for electron location in the planetary model (labeled A-E). Which of the five electrons locations would be “allowed” and which “forbidden” according to the two scientists? (Hint: they agree about most, but not all of the electron locations.)

3. Two different elements will require different colors (energies) of light to facilitate electron transitions even if both elements contain the same number of electrons. What difference between the allowed electron orbits of the elements causes this?

4. What is a photon?

5. If an electron moves from position C to position B on the diagram above, is a photon emitted or absorbed?

6. If an electron moves from position B to position E on the diagram above, is a photon emitted or absorbed?

7. In #5 and #6 which transition involves the highest energy photon?

Why?

8. List the colors of visible light in order from greatest energy to least energy.

9. Which color of visible light has the highest frequency?

10. Most FM radio stations have frequencies of 90-100 MHz. AM radio stations have frequencies from 500 to 1600 kHz. Which type of radio wave has more energy?

“allowed orbits” “forbidden orbits”

Rutherford

Bohr

Unit 8 LPChem:Wz:1415

Name Period Date

Waves & Particles – Ch. 4

11. In the diagrams below, which wave has the higher frequency? Explain.

12. Briefly describe what Planck and Einstein contributed to the concept of Quantum Theory.

13. One of the lines in the emission spectrum of sodium has a wavelength of 590 nm. What is the frequency of this line?

14. A radio station broadcasts at a frequency of 91.3 MHz (9.13 107 Hz). What is the wavelength of this EM wave?

15. Calculate the energy of a gamma ray photon with a frequency of 6.0 1022 Hz.

16. When an electron in a hydrogen atom drops from the fifth to the second energy level,

4.58 10-19 J of energy is released. Find the frequency of the photon that is produced.

17. Order the following regions of the EM spectrum from lowest to highest energy: infrared, microwaves, ultraviolet, visible red, visible green, X-rays, radio waves, gamma rays.