Physical Science Ch 17 19 Elements

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

• silicon
• diamond
• sand
• graphite

In the gaseous state ______ form diatomic covalent molecules.

• noble gasses
• alkali metals
• alkaline earth metals
• halogens

When hydrogen 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

The ______ often occur in nature as uncombined elements.

• alkaline earth metals
• alkali metals
• actinide series
• transition elements

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 ______.

• metals
• nonmetals
• transition elements
• noble gases