Unit 2 Questions

When energy is applied to the valence electrons, the energy is distributed evenly among all the valence electrons. Answer 1: True Answer 2: False

T

The outermost shell is called the "valence shell" and electrons in this shell are called "valence electrons." The maximum number of electrons in the valence shell is _____. Answer 1: two Answer 2: four Answer 3: six Answer 4: eight

D

To prevent corrosion from forming on low-voltage electronic circuitry connectors, _____ plating is often placed on copper cable terminals. Answer 1: silver Answer 2: gold Answer 3: aluminum Answer 4: a or b

D

Insulators have four to five valence electrons. Answer 1: True Answer 2: False

F

Semiconductors contain more than six valence electrons. Answer 1: True Answer 2: False

F

Atoms strive for chemical stability, which is the condition where the valence shell is completely filled. This is often accomplished by atomic bonding which results in a stable compound. Answer 1: True Answer 2: False

T

Because the attractive force of the protons is greater on electrons that are closest to the nucleus, electrons in the orbits farthest away from the nucleus are more easily separated from their atomic structure. Answer 1: True Answer 2: False

T

Compounds can change the electrical characteristics of an individual atom. For example, the insulating aluminum-oxide compound is very difficult to break and it often results in the overheating of aluminum conductors at their terminals. Answer 1: True Answer 2: False

T

Conductive materials have one, two, or three valence electrons. Elements with one valence electron, such as silver, copper, and gold, make the best electrical conductors. Answer 1: True Answer 2: False

T

The attraction between the positive charge of the protons and negative charge of electrons keeps the electrons from breaking out of their orbit. Answer 1: True Answer 2: False

T