Name _________________________________________________

 

What is an atomic number?

 

Lesson Review

 

Write true if the statement is true. If the statement is false, change the underlined

term to make the statement true. Write your answers in the spaces provided.

 

____________________ 1. Each element has a different atomic number.

 

____________________ 2. An atom of gold is made up of fewer protons than an atom of oxygen.

 

____________________ 3. In an atom, the number of protons is greater than the number of electrons.

____________________ 4. Hydrogen has an atomic number of 79.

 

____________________ 5. The number of electrons found in the nucleus of an atom is that elementís atomic number.

____________________ 6. An atom has no overall electric charge.

 

____________________ 7. In an atom, the charges of the electrons are cancelled by the charges of the protons.

____________________ 8. The atomic number of oxygen is 8.

 

____________________ 9. The element with the smallest atomic number is helium.

 

____________________ 10. No two elements have the same atomic number.

 

Skill Challenge

Skills: interpreting a table, analyzing

Complete the following table.

Element

Atomic Number

Number of Electrons

1.

 

2.

                 82

3.

 

             11

4.

5.

 

6.

               29

       Gold

 

7.

8.

9.

 

             16

10.