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The Bohr Atom

The Bohr Atom. Essential Question. How can properties of a wave be used in energy calculations?. The Bohr atom. Protons and neutrons are located in the nucleus Electrons orbit the nucleus Also called the “Planetary model” because it is similar to the solar system. Energy levels “N”.

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The Bohr Atom

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  1. The Bohr Atom

  2. Essential Question • How can properties of a wave be used in energy calculations?

  3. The Bohr atom • Protons and neutrons are located in the nucleus • Electrons orbit the nucleus • Also called the “Planetary model” because it is similar to the solar system

  4. Energy levels “N” • Electrons occupy differing orbits based on energy levels • Quantized: Can only have certain energy levels • As you move away from the nucleus, levels increase in energy • Number per level=2n2

  5. Lets practice • Nitrogen: • How many electrons? • How many in the first energy level? • How many in the second energy level? • Draw the picture

  6. You try • Calcium (Ca): • How many total electrons? • How many in the first energy level? • How many in the second energy level? • Third? • Draw the picture

  7. Try these! • Phosphorus: • Carbon: • Nitrogen:

  8. How are nitrogen and carbon similar? How are they different? • How are nitrogen and phosphorus similar? How are they different?

  9. Diagram of Absorption vs. Emission

  10. Absorption vs. Emission • Absorption • If energy is added, electrons can become excited and jump to higher energy levels. • They can move multiple energy levels • Emission: • Electrons are not stable in their excited state • Want to emit energy to return to their original state • Do this by emitting a photon (packet of light). • The color given off depends how many energy levels the electrons fall.

  11. When electrons absorb or emit energy, they act as a wave

  12. Electromagnetic Spectrum

  13. Essential Question • How can the properties of waves be used in energy calculations?

  14. What do you already know about the electromagnetic spectrum?? • Based on the video, write down something you already know about the electromagnetic spectrum. We will turn and talk, then do a whip around. • https://www.youtube.com/watch?v=P_PVz8HrrCI

  15. Video • In the video, write down something about each type of radiation. http://www.youtube.com/watch?v=P_PVz8HrrCI • Gamma • X-rays • UV • visible • Infrared • Microwaves • Radio

  16. Visible Light Spectrum

  17. FREQUENCY, WAVELENGTH, ENERGY Frequency Relationship

  18. How to convert between the two • C= λ · ν • c= speed of light (3.00 x 108 m/s) • λ = wavelength (m) • ν = frequency (Hertz: Hz) • 1.0 nm = 1 x 10-9 m • Let’s Practice! C ν λ

  19. Why is this important • Allows us to calculate the amount of energy released. • h= Planck’s Constant (6.63 x 10-34 J · s)

  20. REVIEW OF EQ: How can the properties of waves be used in energy calculations? • Without looking, put the following in order from longest wavelength, to shortest wavelength. • X-ray Microwave Radio Wave • Infrared Visible Gamma • Circle the one with the highest frequency? • Put a smiley face over the one with the most amount of energy

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