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

• allotropes
• carbons
• silicons
• isotopes

Metals can be used as wire because they are ______.

• ductile
• malleable
• shiny
• dull

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 ______.

• actnides
• transition metals
• lanthanides
• noble gases

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

• alkaline earth metals
• alkali metals
• halogens
• actnides

Hydrogen is grouped with the alkali metals because it ______.

• is a metal
• has one electron in its outer energy level
• is a gas
• does not readily form compounds

The bonding that occurs when positively charged ions are surrounded by a cloud of electrons is called ______ bonding.

• ionic
• radioactive
• covalent
• metallic

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

• iron, nickel, and cobalt
• copper, silver and gold
• mercury, zinc and cadmium
• neon, helium and xenon

When metals combine with nonmetals, the atoms of the metals tend to lose electrons, forming _____ bonds.

• ionic
• covalent
• triple
• unbreakable

Which of the following is not a property of a nonmetal?

• brittle
• poor conductor of heat and electricity
• luster
• dull