Atomic Spectra Answers

1

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The table below shows the wavelengths of visible light that correspond to different colors.A student analyzes the emission spectrum of an unknown element and observes strong lines at the following wavelengths: 656 nm, 486 nm, 434 nm.Which absorption spectrum is the student most likely viewing?

A

A line spectrum with one black line in purple, blue, light blue and red.

B

A line spectrum with 3 black lines in purple, one black line in blue, 2 black lines in light blue, one black line in orange and one black line in orange-red.

C

A line spectrum with 3 black lines in purple, 2 black lines in blue, 2 black lines in light blue, one black line in green and one black line in yellow.

D

A line spectrum with 4 black lines in blue, 6 black lines in green, 3 black lines in yellow and one black line in orange.

2

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What is released when an excited electron returns to a lower energy state?

A

an isotope

B

a proton

C

electricity

D

electromagnetic radiation

3

Which best explains what happens when an electron moves from an excited state to the ground state?

A

The electron absorbs energy as it moves to a lower energy level.

B

The electron absorbs energy as it moves to a higher energy level.

C

The electron releases energy as it moves to a higher energy level.

D

The electron releases energy as it moves to a lower energy level.

4

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3 and the last is labeled n = 4. There is an arrow from n = 4 to n = 1 labeled A. There is an arrow from n = 3 to n = 2 labeled B. There is an arrow from n = 3 to n = 1 labeled C. There is an arrow from n = 2 to n = 1 labeled D.

A

B

C

D

5

This image shows a stream of positively charged particles being directed at gold foil. The positively charged particles are called "alpha particles” and each one is like a nucleus without any electrons.

A

Alpha particles are mostly empty space, so they move in random directions, and one of these alpha particles can strike point X.

B

The gold atoms contain negative electrons, so when alpha particles strike the gold they keep moving but in various directions.

C

If an alpha particle hits the gold foil, a gold nucleus splits and a particle from it flies out at point X.

D

When the dense, positive alpha particle passes close to a positive nucleus of gold, the alpha particle repels and hits the screen at point X.

6

The emission spectrum of iodine is shown below.Which is the absorption spectrum?

A

A line spectra with 4 purple lines, 6 blue lines, 3 light blue lines, 5 green-blue lines, 6 green lines, 7 yellow lines, 3 orange lines and 14 red lines.

B

A line spectra with 6 purple lines, 9 blue lines, 6 light blue lines, 3 green-blue lines, 6 green lines, 2 yellow lines, 5 orange lines and 10 red lines.

C

A line spectra with 2 black lines in purple, 6 black lines in blue, 3 black lines in light blue, 1 black line in green-blue, 10 black lines in green, 8 black lines in yellow, 6 black lines in orange and 8 black lines in red.

D

A line spectra with 4 black lines in purple, 8 black lines in blue, 6 black lines in light blue, 3 black line in green-blue, 10 black lines in green, 4 black lines in yellow, 4 black lines in orange and 12 black lines in red.

7

Which excited electron has the lowest energy?

A

A green dot in the middle of 5 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3. The fourth away from the green dot is labeled n = 4 and the last is labeled n = 5. There is an orange dot on the n = 5 circle.

B

A green dot in the middle of 5 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3. The fourth away from the green dot is labeled n = 4 and the last is labeled n = 5. There is an orange dot on the n = 4 circle.

C

A green dot in the middle of 5 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3. The fourth away from the green dot is labeled n = 4 and the last is labeled n = 5. There is an orange dot on the n = 3 circle.

D

A green dot in the middle of 5 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3. The fourth away from the green dot is labeled n = 4 and the last is labeled n = 5. There is an orange dot on the n = 2 circle.

8

What type of spectrum is shown below?

A

absorption

B

electromagnetic

C

emission

D

infrared light

9

An absorption spectrum of oxygen is shown below.What is most likely the emission spectrum of oxygen?

A

A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 6 lines in the yellow, 4 lines in the orange and 15 lines in red.

B

A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 7 lines in the green, 6 lines in the yellow, 5 lines in the orange and 10 lines in red.

C

A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 2 lines in blue-green, 4 lines in the green, 2 lines in the yellow, 3 lines in the orange and 4 lines in red.

D

A rainbow for a line spectra. There are 5 lines in purple, 6 lines in blue, 1 line in blue-green, 4 lines in the green, 3 lines in the yellow, 4 lines in the orange and 4 lines in red.

10

A table of the visible light spectrum is shown below.Tyrone analyzes the emission spectrum of an unknown element. He observes two discrete lines at 600 nm and 650 nm, and he sees many lines corresponding to shorter wavelengths, with the strongest line being at 475 nm.Which emission spectrum is Tyrone most likely analyzing?

A

A line spectrum with one black line in purple, blue, light blue and red.

B

A line spectrum with 3 black lines in purple, one black line in blue, 2 black lines in light blue, one black line in orange and one black line in orange-red.

C

A line spectrum with 3 black lines in purple, 2 black lines in blue, 2 black lines in light blue, one black line in green and one black line in yellow.

D

A line spectrum with 4 black lines in blue, 6 black lines in green, 3 black lines in yellow and one black line in orange.

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