IPC Ch. 17: Elements and Their Properties

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

• silicon

• diamond

• sand

• graphite

The process by which a solid changes directly to a gas without first becoming a liquid is called _________________.

• condensation

• ionization

• sublimation

• evaporation

When halogens reacts with the active metals, it .

• shares electrons

• gains one electron

• loses one electron

• loses two electrons

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

• allotropes

• carbons

• silicons

• graphites

At room temperature, most metals are .

• liquids

• solids

• radioactive

• gases

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

• silver

• diamond

• quartz

• graphite

Metals can be used as wire because they are .

• ductile

• malleable

• shiny

• alloys

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

• metals

• nonmetals

• metalloids

• noble gases

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

• actinides

• lanthanides

• transition elements

• noble gases

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

• alkaline earth metals

• halogens

• alkali metals

• actinides