Atomic Numbers

Boron is a metalloid, with properties of metals and nonmetals. It conducts infrared light. What is its atomic number?

• 4

• 5

• 6

• 7

Fluorine is the first halogen. Pure fluorine is a corrosive yellow gas. Do you know its atomic number

• 7

• 8

• 9

• 10

Do you know how many protons are in an atom of lithium? It is the lightest of the metals

• 4

• 3

• 2

• 1

You need oxygen to breathe. What is the atomic number of oxygen?

• 5

• 6

• 7

• 8

Another important element is carbon, found in all organic molecules. How many protons are in an atom of carbon

• 4

• 6

• 8

• 2

Number of valence electrons in C atom

• 6

• 4

• 3

• 2

How many protons are in Calcium?

• 2

• 8

• 20

• 10

What type of element is Potassium?

• Metalloid

• Non Metal

• Metal

• Noble Gas

The Lewis Dot diagram for Carbon would have how many dots

• 2

• 3

• 1

• 4

Charge on Cl atom :

• +1

• -1

• +2

• -2