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

Elements that form salts by combining with metals are ____.

Substances that conduct an electric current only under certain conditions are most likely to be ____.

Different forms of the same element that have different properties because of different atom arrangements are 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 ____.

Hydrogen is grouped with the alkali metals because it ____.

A chemical family whose members exist as reactive diatomic molecules in the gaseous phase is the ____.

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

A family of elements that has two electrons in its outer energy level is the ____.

Metals can be used as wire because they are ____.

Elements in which the outer electrons are NOT held tightly are most likely to form ____ bonds.

Bromine is the only halogen and nonmetal that is normally a ___.

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

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

Three transition elements in Group 12 of the periodic table are ____.

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

The noble gases are in ____.

A family of elements that contains the most reactive metals is the ____.