Periods & Groups

Periods go from left to right. Another word for a period could be a row. Groups go up and down. Other words for groups could be column or family.

• Periods are rows moving from left to right; groups are columns moving up and down.

• Periods are columns; groups are rows.
• Periods go up and down; groups go left to right.
• Periods are families; groups are rows.

There are 7 periods. Each period fills an electron shell, also known as an energy level.

• 5
• 8
• 7
• 10

Elements in the same group have similar properties!

• Elements in different groups have identical properties
• False
• Elements in the same period have similar properties
• True

Why are elements in the same family have similar chemical behavior?

• They have the same atomic mass.
• They are all metals.
• They have the same valence electron configurations.

• They have identical physical properties.

The alkali metals and the alkaline earth metals are reactive metals. The halogens and the noble gases are also reactive metals.

• Inert gases are highly reactive nonmetals.

• Alkali metals are nonreactive metals.

• Halogens are reactive nonmetals; inert gases are nonreactive.

• Alkaline earth metals are inert gases.