Columns on the periodic table are called ______________.

• groups

• lines

• periods

• rules

Rows on the periodic table are called ______________.

• groups

• lines

• periods

• rules

An atom has 18 protons and 8 valence electrons. Which statement would best identify this element?

• The element is "happy" or stable because its outer energy level is filled.

• The element has an atomic mass of 18.

• The element is highly reactive with eight electrons in its outer shell.

• The element is a metal.

Identify number 14 on the periodic table square below.

• atomic mass

• chemical symbol

• atomic number

• element name

Identify number 15 on the periodic table square below.

• atomic number

• element name

• atomic mass

• chemical symbol

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

Beryllium has how many protons?

• 4
• 9.0122
• 2
• 13.0122

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

What element is this?

• Helium
• Hydrogen
• Argon
• Silver

Rows on the period table are called _____ while columns are called _____.

• groups, families
• groups, periods
• periods, groups
• families, groups