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11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL). CHEMISTS THINK THEY’RE COOL…

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Presentation on theme: "11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL). CHEMISTS THINK THEY’RE COOL…"— Presentation transcript:

1 11.2 – ATOMIC EMISSION SPECTRA (C – LEVEL)

2 CHEMISTS THINK THEY’RE COOL…

3 OBJECTIVES WWBAT… Explain atomic emission spectra Determine the possible energies of photons emitted from an atom

4 PRISMS AND RAINBOWS

5 LET’S TAKE A LOOK AT COLORED FLAMES…

6 ATOMIC EMISSION SPECTRA Fingerprint of an element Occurs when an element is excited and allowed to return to its ground state

7 FORMATION OF ATOMIC EMISSION SPECTRA

8 As an electron moves up energy levels, it increases its energy Energies closest to the nucleus have large, negative energies (remember, PE elec = kqq/d) Atoms, theoretically, have an infinite number of energy levels, with n = infinity having an energy of zero.

9 DETERMINING THE WAVELENGTH OR FREQUENCY E i – E f = energy of photon (hƒ) *NOTE: in advanced texts, frequency is denoted by the Greek letter nu, which looks a lot like a v. The Texas Eduation Agency has decided frequency is denoted by the fancy f, whose name is unbeknownst to me. *Additional fun fact: in advanced texts, potential energy is not denoted by “PE,” but by the letter U. The more you know…

10 EXAMPLE The first four energy levels of an atom are listed above. Assume n = 4 has an energy of 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

11 EXAMPLE The first four energy levels of an atom are listed above. Assume n = 4 has an energy of 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 = infinityn = 4n = 3n = 2 n = 4 n = 3 n = 2 n = 1

12 EXAMPLE The first four energy levels of an atom are listed above. Assume n = 4 has an energy of 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 = infinityn = 4n = 3n = 2 n = 44.2 eV n = eV1.84 eV n = eV9.4 eV7.36 eV n = eV50.2 eV48.36 eV40.8 eV

13 EXAMPLE The first four energy levels of an atom are listed above. Assume n = 4 has an energy of 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 = infinityn = 4n = 3n = 2 n = 44.2 eV n = eV1.84 eV n = eV9.4 eV7.36 eV n = eV50.2 eV48.36 eV40.8 eV

14 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

15 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

16 OBJECTIVES WWBAT… Explain atomic emission spectra Determine the possible energies of photons emitted from an atom


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