Unit 3 Review

• Periods
• Groups

• Periods
• Groups

• Same group
• Same period

How did Mendeleev arrange the elements?

• alphabetical 
• density
• melting point
• atomic mass

The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

A vertical column is called...

• group
• tower
• period
• crew

The blue atoms are called 

• metals
• nonmetals
• metalloids
• noble gases

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

Which is a halogen?

• Helium
• Chlorine
• Oxygen
• Neptune

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium