At room temperature, most metals are _________.

The process by which solid iodine particles change directly to gas without first becoming liquid is called __________.

An allotrope of carbon that is soft and can be used as a lubricant is _______.

An allotrope of carbon that is hard and is often used in jewelry is _________.

The elements in Groups 3 through 12 of the periodic table are the _________.

The only metal that is a liquid at room temperature is _______.

A synthetic element that is used in smoke detectors is ________.

All synthetic elements are ____.

Cobalt, iron, and nickel are known as the _____ triad.

Any element with an atomic number great than that of uranium is a(n) ________.

The noble gases are in _______.

Elements that lie along the stair-step line of the periodic table are _______.

Ductile

Malleable

Why are noble gases so stable?

Why is mercury rarely used in thermometers that take body temperatures?