Review

How many protons are in Beryllium?

• 4
• 9
• 5
• 2

What does "1.00794" mean in this image?

• number of protons

• number of neutrons

• Atomic mass

• average number of valence electrons

As you move from left to right across the periodic table, the atomic number increases. 

• True
• False

What is the element symbol for boron? 

• B
• Bo
• Bn
• W

• Periods
• Groups

• Periods
• Groups

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 yellow atoms are called 

• metals
• nonmetals
• metalloids
• noble gases