How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors? a. They have one or two valence electrons, so they cannot lose electrons easily.

b. They have one or two valence electrons, so they can lose or gain electrons.

c. They have three to six valence electrons, so they cannot lose electrons easily.

d. They have three to six valence electrons, so they can lose or gain electrons

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu