Experience 3: Atomic Emission Spectra

Experience 3: Atomic Emission Spectra

by Danielle Pedroso

Multiple Choice

Which Danish physicist proposed an atomic model that described electrons as moving in circular orbits around the nucleus?

• Niels Bohr

• Tycho Brahe

• Stephen Hawking

• Carl Sagan

​The Bohr Model

• ​Each electron orbit have fixed energies called energy levels

• ​It takes a quantum of energy for an electron to move from one level to another

• ​Lowest energy level = "Ground State"

• ​Higher energy level = "Excited State"

Multiple Choice

The amount of energy required to move an electron from one energy level to another is a _______ of energy. 

• atomic emission spectrum

• energy level

• quantum

• Ground State

Multiple Choice

What is the lowest possible energy level that an electron can occupy?

• Lower energy level

• Ground State

• Excited State 

• Depressive State

Multiple Choice

How does an electron get from a lower energy level to an excited state (higher energy level)? 

• It absorbs light

• It emits light 

• it simply can do whatever it wants

• that's how the statistics describe it

How does atoms emit light?

​When an electron absorbs light (energy), it jumps to a higher energy level (an excited state). Then the electron becomes unstable and releases energy by going from an excited state to a lower state.

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The light absorbed and emitted is exactly equal to the energy difference between energy levels in the atom. ​

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Multiple Choice

Which of the following electronic transitions in the oxygen atom will result in light emission?

• $$n_i=1⟶n_f=2$$

• $$n_i=1⟶n_f=3$$  

• $$n_i=3⟶n_f=2$$  

• $$n_i=2⟶n_f=3$$  

Multiple Choice

If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?

• 3

• 4

• 5

• 6

​The Bohr Model

• ​Up to two electrons can occupy the energy level (orbit) closest to the nucleus.

• ​The second orbit can have up to 8 electrons

Multiple Choice

How many electrons can occupy the lowest energy level? 

• 1 only

• up to 2

• up to 4

• up to 8

Multiple Choice

How many electrons can occupy the second energy level? 

• up to 2

• up to 4

• up to 6

• up to 8