Atomic Spectra Answers

1

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Which statement is part of Bohr's atomic model?

A

Electrons absorb or emit light when they change energy levels.

B

Electrons with the highest energy are found with orbits of the smallest radius.

C

Electrons exist as waves and clouds of probability with specific orbits and shapes.

D

Electrons orbit the nucleus in narrow ellipses, like how the planets orbit the Sun.

2

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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

3

What type of spectrum is shown below?

A

absorption

B

electromagnetic

C

emission

D

infrared light

4

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.

5

What causes the appearance of lines in an emission spectrum?

A

Light is absorbed as an electron moves to a higher energy state.

B

Light is released as an electron moves to a lower energy state.

C

An electron is released as light when it moves to a lower energy state.

D

An electron is released as light when it moves to a higher energy state.

6

What is the main difference between the Schrödinger model and the Bohr atomic model?

A

Schrödinger believed that electrons could only exist in orbits, but Bohr stated that electrons could be found anywhere in the atom.

B

Bohr believed electron orbits were circular, but Schrödinger’s equations represent complex shapes describing the probable locations of electrons.

C

The Bohr model did not explain the emission and absorption spectrum, but the energy levels described by Schrödinger explained this property.

D

Bohr believed that the electrons circle the nucleus because positive particles attract negative particles, while Schrödinger believed that an electron was a wave.

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

The emission spectrum of the element lithium is shown below.What is the best estimate of the color that will be seen when a sample of lithium gas absorbs a lot of energy?

A

mix of blue and green

B

mix of red and orange

C

mix of yellow and green

D

pure yellow

9

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.

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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