11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL). CHEMISTS THINK THEY’RE COOL…
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Transcript of 11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL). CHEMISTS THINK THEY’RE COOL…
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11.2 – ATOMIC EMISSION SPECTRA
(C – LEVEL)
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CHEMISTS THINK THEY’RE COOL…
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OBJECTIVES
WWBAT…
• Explain atomic emission spectra
• Determine the possible energies of photons emitted from an atom
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PRISMS AND RAINBOWS
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LET’S TAKE A LOOK AT COLORED FLAMES…
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ATOMIC EMISSION SPECTRA
• Fingerprint of an element
• Occurs when an element is excitedand allowed to return to its ground state
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FORMATION OF ATOMIC EMISSION SPECTRA
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FORMATION OF ATOMIC EMISSION SPECTRA
• As an electron moves up energy levels, it increases its energy
• Energies closest to the nucleus have large, negative energies (remember, PEelec = kqq/d)
• Atoms, theoretically, have an infinite number of energy levels, with n = infinity having an energy of zero.
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DETERMINING THE WAVELENGTH OR FREQUENCY
Ei – Ef = energy of photon (hƒ)
*NOTE: in advanced texts, frequency is denoted by the Greek letter nu, which looks a lot like a v. The TexasEduation Agency has decided frequency is denoted by the fancy f, whose name is unbeknownst to me.
*Additional fun fact: in advanced texts, potential energyis not denoted by “PE,” but by the letter U. The more youknow…
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EXAMPLE
The first four energy levels of an atom are listed above. Assume n = 4 has an energy of -4.20 eV, and the highest energy level (n = infinity) is 0 eV. Which of the following energies is not possible for a photon emitted from this atom?
A) 48.36 eV
B) 40.8 eV
C) 21.6 eV
D) 7.36 eV
E) 3.20 eV
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EXAMPLE
The first four energy levels of an atom are listed above. Assume n = 4 has an energy of -4.20 eV, and the highest energy level (n = infinity) is 0 eV. Which of the following energies is not possible for a photon emitted from this atom?
A) 48.36 eV
B) 40.8 eV
C) 21.6 eV
D) 7.36 eV
E) 3.20 eV
Transition to… n = infinity n = 4 n = 3 n = 2
n = 4
n = 3
n = 2
n = 1
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EXAMPLE
The first four energy levels of an atom are listed above. Assume n = 4 has an energy of -4.20 eV, and the highest energy level (n = infinity) is 0 eV. Which of the following energies is not possible for a photon emitted from this atom?
A) 48.36 eV
B) 40.8 eV
C) 21.6 eV
D) 7.36 eV
E) 3.20 eV
Transition… n = infinity n = 4 n = 3 n = 2
n = 4 4.2 eV
n = 3 6.04 eV 1.84 eV
n = 2 13.6 eV 9.4 eV 7.36 eV
n = 1 54.4 eV 50.2 eV 48.36 eV 40.8 eV
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EXAMPLE
The first four energy levels of an atom are listed above. Assume n = 4 has an energy of -4.20 eV, and the highest energy level (n = infinity) is 0 eV. Which of the following energies is not possible for a photon emitted from this atom?
A) 48.36 eV
B) 40.8 eV
C) 21.6 eV
D) 7.36 eV
E) 3.20 eV
Transition… n = infinity n = 4 n = 3 n = 2
n = 4 4.2 eV
n = 3 6.04 eV 1.84 eV
n = 2 13.6 eV 9.4 eV 7.36 eV
n = 1 54.4 eV 50.2 eV 48.36 eV 40.8 eV
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CHECK YOURSELF
The following diagram illustrates the energy levels for an atom. A photon of which energy would not be able to be emitted from this atom?
A) 13.6 eV
B) 12.1 eV
C) 10.2 eV
D) 6.45 eV
E) 1.12 eV
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CHECK YOURSELF
The following diagram illustrates the energy levels for an atom. A photon of which energy would not be able to be emitted from this atom?
A) 13.6 eV
B) 12.1 eV
C) 10.2 eV
D) 6.45 eV
E) 1.12 eV
![Page 16: 11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL). CHEMISTS THINK THEY’RE COOL…](https://reader036.fdocuments.in/reader036/viewer/2022062620/551bb9c5550346af588b45de/html5/thumbnails/16.jpg)
OBJECTIVES
WWBAT…
• Explain atomic emission spectra
• Determine the possible energies of photons emitted from an atom