Elements, Periodic Table, & Reactivity

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

• diamond.

• silicon.

• graphite.

• sand.

In the gaseous state _______ form diatomic covalent molecules.

• alkali metals

• noble gases

• halogens

• alkaline earth metals

When hydrogen reacts with the active metals, it 

• gains one electron.

• shares electrons.

• loses two electrons.

• loses one electron.

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

• carbons.

• allotropes.

• graphite.

• silicons.

At room temperature, most metals are

• solids.

• liquids.

• gases.

• radioactive.

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

• diamond.

• silver.

• graphite.

• quartz.

Metals can be used as wire because they are

• malleable.

• ductile.

• alloys.

• shiney.

The _____ often occur in nature as uncombined elements.

• alkali metals

• alkaline earth metals

• transition elements

• actinide series

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

• nonmetals.

• metals.

• noble gases.

• metalloids.

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

• lanthanides.

• actinides.

• noble gases.

• transition elements.