Columns and Rows of the Periodic Table

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

Sodium (Na) is found in period 

• 3

• 2

• 4

• 1

The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

• atomic mass

• atomic number

• valence electrons

• number of isotopes

What period does the element I - Iodine belong to?

• 17

• 6

• 3

• 5

What are the columns referred to on the Periodic Table of Elements?

• Families or groups

• Periods

What are the columns on the periodic table called?

• periods

• groups

• atomic numbers

• atomic masses

SIDE TO SIDE rows on the periodic table are

• groups

• periods

How many periods are on the periodic table?

• 5

• 6

• 7

• 8

Each row in the periodic table is called a 

• group

• period

• cluster

• unit