Element of the Day Np
Neptunium (nep­tew­nee­әm) is a chemical element with the symbol Np and atomic number 93. A radioactive metal, neptunium is the first transuranic element and belongs to the actinide series. Its most stable isotope, 237Np, is a by­product of nuclear reactors and plutonium production and it can be used as a component in neutron detection equipment. Neptunium is also found in trace amounts in uranium ores due to transmutation reactions.
Neptunium (named for the planet Neptune, the next planet out from Uranus, after which uranium was named) was discovered by Edwin McMillan and Philip H. Abelson in 1940 at the Berkeley Radiation Laboratory of the University of California, Berkeley. The team produced the neptunium isotope 239Np (2.4 day half­life) by bombarding uranium with slow moving neutrons. It was the first transuranium element produced synthetically and the first actinide series transuranium element discovered.
Light absorption occurs when photons are captured by a substance, while _____________ occurs when light photons are emitted by a substance.
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Chemistry
1. Element of the Day (5)
2. Notes (15)
3. Continue POGIL Activity (30)
4. Start Homework (20)
Announcements
Due Today: POGIL Activity through question 17.
Due Monday: Complete POGIL Activity and read pages 278 to 289 and answer questions 3, 7, 10 ­ 12, 14, 19, 24, 26, and 27.
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Electron Configuration Notes Rutherford Model of the Atom:
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Electron Configuration Notes Turn and Talk: What is the relationship between frequency and wavelength.
c = fλ
3 X 108 m/s
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Electron Configuration Notes Electromagnetic Radiation
Wavelength Frequency
Photons
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Electron Configuration Notes Demonstration
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Why do we see only a few (4) spectral lines from hydrogen, yet we see a continuos spectrum from sunlight?
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Electron Configuration Notes Emission of energy by an atom
http://www.avogadro.co.uk/light/bohr/spectra.htm
Key Terms
Excited State
Ground State
Conservation of Energy
Quantized 7
Electron Configuration Notes draw figure 10.14/.15
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Electron Configuration Notes Bohr Model of the Atom
Wave Mechanical Model of the Atom
Key Term:
Orbital
http://www.youtube.com/watch?v=45KGS1Ro­sc
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Continue POGIL Activity
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Exit Question
What observation did Bohr's model account for that Rutherford's model could not account for?
Reminder
Due Monday: Complete POGIL Activity and read pages 278 to 289 and answer questions 3, 7, 10 ­ 12, 14, 19, 24, 26, and 27.
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