Atoms and The Periodic Table

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

The number at the bottom of each square on the periodic table is the ...

• atomic number
• atomic mass
• chemical symbol
• element name

The number at the top of each square on the periodic table is the ...

• atomic number
• atomic mass
• Chemical Symbol
• Element Name

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

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

• Metals
• Nonmetals
• Metalloids
• Periods

• energy levels
• valence electrons
• protons
• neutrons

• energy levels
• valence electrons
• protons
• neutrons

• Same group
• Same period

• Group 1
• Group 17
• Group 2
• Group 18