Electromagnetic Radiation and Valence Electrons
Introductory Chemistry, 2e (Tro) Chapter 9
True/False Questions
- When the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically.
- A particle of light is called a packet.
- Ultraviolet light produces suntans and sunburns.
- Electrons behave like particles and we can describe their exact paths.
- The ground state is when an electron in an atom is excited into the lowest possible vacant orbital.
- Bromine has 17 valence electrons.
- 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
