Lesson 3 - The Arrangement Of Electrons In Atoms
- 1.It is important to learn about quantum mechanics because
- A.
This information allows us to understand why some chemicals are colorful and others are dull and muted.
- B.
This information tells us why certain elements may be very reactive while others may be relatively non-reactive.
- C.
This information tells us why certain elements are found as gases at room temperature.
- D.
This information tells us how atoms grow to become larger molecules.
- 2.The first quantum number is known as the _________quantum number and says that ________________________.
- A.
Orbital quantum number; electrons are found in layers around the nucleus of the atom.
- B.
Principle quantum number; electrons are found in four different shapes.
- C.
Principle quantum number; electrons are found in layers around the nucleus of the atom.
- D.
Spin quantum number; electrons spin in two directions while in travel.
- 3.How many layers of electrons might one encounter in an atom according to the theory of quantum mechanincs?
- A.
3
- B.
8
- C.
7
- D.
12
- 4.The orbital quantum number says that
- A.
Electrons are found in layers around the nucleus of the atom.
- B.
Electrons are found in 5 different shaped pathways.
- C.
Electrons spin as they move along their pathways.
- D.
Electrons travel in pathways having four different shapes.
- 5.When thinking about the different shaped paths on which electrons travel, which shape below is not one of the shapes we discussed?
- A.
Rectilinear
- B.
Spherical
- C.
Pear-shaped
- D.
Dumb-bell shaped
- 6.The magnetic quantum number says
- A.
That the s-shaped orbits can be found in three different orientations in space.
- B.
That the p-shaped electrons move in three different shaped pathways.
- C.
That the p-shaped orbits are found in three different orientations in space (a, b, c)
- D.
That the p-shaped orbits are found in three different orientations in space (x, y, z)
- 7.The Spin quantum number says
- A.
That the electrons travel in pairs with one electron spinning clockwise and the second spinning counterclockwise.
- B.
That the electrons travel in pairs with one electron spinning clockwise and the second electron sitting in a stationery position.
- C.
That the electrons are arranged in p-shaped orbits aligned along three axis in space.
- D.
That the nucleus of the atom rotates along the x-axis while the electrons, traveling in pairs, each spins accordingly.
- 8.Choose the element symbol pair which is correctly matched.
- A.
Carbon Ca
- B.
Calcium C
- C.
Chlorine Ch
- D.
Cobalt Co
- 9.The atomic number of an element tells the
- A.
Address of the element
- B.
Number of protons, neutrons and croutons found in an atom of that element.
- C.
Number of protons, neutrons, and electrons found in an atom of that element.
- D.
The number of electrons found spinning clockwise around one atom of that element.
- 10.Of the three subatomic particles, electrons have the greatest mass.
- A.
True
- B.
False
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