1. II. Bohr Model of the Atom (p. 94 - 97)
Ch. 4 - Electrons in Atoms
II. Bohr Model of the Atom (p )
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2. C. Johannesson

3. Bohr's Atom: Quantum Behavior in Hydrogen
Concept Simulation - reenacts electron's 'jump' and 'fall' to precise energy levels in a hydrogen atom.
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4. A. Line-Emission Spectrum
Hydrogen Gas
excited state
ENERGY IN
PHOTON OUT
ground state
Atoms are “excited” with an electric current
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5. B. Bohr Model
e- exist only in orbits with specific amounts of energy called energy levels
Therefore…
e- can only gain or lose certain amounts of energy
only certain photons are produced
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6. B. Bohr Model 6
Energy of photon depends on the difference in energy levels
Bohr’s calculated energies matched the IR, visible, and UV lines for the H atom 5 4 3 2 1
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7. Bohr’s calculations only worked for hydrogen! 
C. Other Elements
Each element has a unique bright-line emission spectrum.
“Atomic Fingerprint”
Helium
Bohr’s calculations only worked for hydrogen! 
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8. a) Electrons b) Protons c) Neutrons d) Both (b) and (c)
According to the Bohr model of the atom, which particles are allowed to exist in any one of a number of energy levels?
a) Electrons b) Protons c) Neutrons d) Both (b) and (c)
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9. The line-emission spectrum of an atom is caused by the energies released when electrons
a) “jump” from a lower energy level to a higher energy level b) “jump” from a higher energy level to a lower energy level c) “jump” from the ground state to an excited state d) None of the above
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10. Because excited hydrogen atoms always produce the same line-emission spectum, scientists concluded that hydrogen
a) has no electrons b) does not release energy c) releases energy of only certain values d) can exist only in the ground state
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11. a) one b) two c) three d) four or more
Bohr’s model correctly explains the spectra of atoms with how many electron(s)?
a) one b) two c) three d) four or more
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12. a) absorption b) emission c) translation d) regression
The process of an atom releasing energy when it moves to a lower energy state is called
a) absorption b) emission c) translation d) regression
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13. In the Bohr model of the atom, in which orbit is an electron in its lowest energy state?
a) In the orbit closest to the nucleus b) In the orbit farthest from the nucleus c) in the electron cloud d) midway between two orbits
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14. Flame test online lab!!!!
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