Electromagnetic Radiation and Valence Electrons

Introductory Chemistry, 2e (Tro) Chapter 9

True/False Questions

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1. When the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically.
2. A particle of light is called a packet.
3. Ultraviolet light produces suntans and sunburns.
4. Electrons behave like particles and we can describe their exact paths.
5. The ground state is when an electron in an atom is excited into the lowest possible vacant orbital.
6. Bromine has 17 valence electrons.
7. The atomic radius of lithium is larger than the atomic radius of nitrogen.

Multiple Choice Questions

1). The number of cycles of a wave that passes a stationary point in one second is called its

• A) wavelength
• B) frequency
• C) crest
• D) trough
• E) none of the above

2). Which color of the visible spectrum has photons with the most energy?

• A) red
• B) orange
• C) green
• D) violet
• E) yellow

3). Which form of electromagnetic radiation has the longest wavelength?

• A) Radio Waves
• B) Microwaves
• C) X-rays
• D) Gamma Rays
• E) Infrared Radiation

4). Which form of electromagnetic radiation has photons with the lowest energy?

• A) Radio Waves
• B) Microwaves
• C) X-rays
• D) Gamma Rays
• E) Infrared Radiation

5.) Which statement below does NOT follow the Bohr Model?

• A) When energy is absorbed by atoms, the electrons are promoted to higher-energy orbits.
• B) When an atom emits light, electrons fall from a higher orbit into a lower orbit.
• C) The energy emitted from a relaxing electron can have any wavelength.
• D) Electrons exist in specific, quantized orbits.
• E) none of the above

6). How many subshells are there in the n = 4 principal shell?

• A) 1
• B) 2
• C) 3
• D) 4
• E) not enough information

7). Which one of the following is the correct orbital diagram for nitrogen?

• A) ^v ^v v v ^
• B) ^v vv v ^ ^
• C) ^v vv ^ ^ ^
• D) ^v ^v ^ ^ ^
• E) none of the above

8). How many electrons are unpaired in the orbitals of nitrogen?

9). How many core electrons are in a chlorine atom?

• A) 14
• B) 5
• C) 9
• D) 3
• E) none of the above

10). What do the alkali metals all have in common?

• A) They all undergo similar reactions.
• B) They all have similar physical properties.
• C) They all form +1 ions.
• D) They all have the same number of valence electrons.
• E) all of the above

11). The size of an atom generally increases

• A) down a group and from right to left across a period.
• B) up a group and from left to right across a period.
• C) down a group and from left to right across a period.
• D) up a group and from right to left across a period.
• E) up a group and diagonally across the Periodic Table.

12). Which of the following atoms is the smallest?

• A) Li
• B) Be
• C) B
• D) O
• E) Ne

Answers: 1t 2f 3t 4f 5f 6f 7t

1b 2d 3a 4a 5c 6d 7d 9d 10c 11e 12a

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