Understanding Elements and the Periodic Table

What is an element?

• An element is a type of chemical bond between atoms.
• An element can be broken down into simpler substances.
• An element is a mixture of different atoms.
• An element is a pure substance made of only one type of atom.

How many kinds of elements are there?

• 7

• 14

• 21

• 92

According to the periodic table, what is a symbol?

What is an Atomic Number?

• The atomic number is the total number of electrons in an atom.
• The atomic number is the mass of an atom in atomic mass units.
• The atomic number is the number of neutrons in an atom.
• The atomic number is the number of protons in an atom. (Shows the place of the element in the list.)

How many elements are in the periodic table?

• 118
• 100
• 115
• 120

How many rows are there in the periodic table?

• 5
• 10
• 7
• 12

How many groups are in the periodic table?

• 18
• 12
• 20
• 16

How is the periodic table set up?

• The periodic table is set up by increasing atomic number in rows and columns based on chemical properties.
• Sorted by the number of electrons in the outer shell
• Organized by the year of discovery
• Arranged by color and size

Explain why there are two groups at the bottom of the periodic table, not in a group.

The periodic table is arranged by metal and

• liquids
• gases
• metalloids
• nonmetals