Periodic table

A rule that states that repeating chemical and physical properties of elements change periodically with the atomic number of the elements is the _________.

• periodic law

• alkaline-earth metals

• actinide

• group rule

Pure forms of these elements are stored in oil so they won't react with oxygen and water in the air.

• Alkali Metals

• Alkaline-earth metals

• Halogens

• Noble Gases

All of the actinides are ___________.

• stable

• radioactive

• shiny

• named after scientists

Most of the elements on the periodic table are classified as _____.

• Metals

• Nonmetals

• Metalloids

• Periods

This class of elements are sometimes called "semiconductors."

• Metals

• Nonmetals

• Metalloids

• Groups

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals

• alkaline earth metals

• halogens

• noble gases

Elements which are shiny, conduct electricity and heat are called

• metal

• nonmetal

• metalloid

• nonexistent

Which element is not a metal?

• Na

• Re

• Al

• B

The atoms along the staircase are called 

• metals

• nonmetals

• metalloids

• noble gases

Which is a halogen?

• Helium

• Chlorine

• Oxygen

• Neptune