Slide 1

Challenge #1
T. Trimpe 2008 http://sciencespot.net/


Slide 2

Use the information provided to answer the questions.
2
He
Helium
4.003

5
B
Boron
10.81

11
Na
Sodium
22.990

17
Cl
Chlorine
35.453

1. What is the atomic number for Chlorine?
2. What is the atomic mass for Boron?

3. How many protons are in an atom of Na?
4. How many neutrons are in an atom of He?
5. How many electrons are in an atom of Cl?

6. How many protons plus neutrons would be in an atom of Chlorine?
7. How many neutrons are in an atom of Na?
8. How many protons plus neutrons are in an atom of Helium?


Slide 3

The answers are …
2
He
Helium
4.003

5
B
Boron
10.81

11
Na
Sodium
22.990

1. What is the atomic number for Chlorine?

2. What is the atomic mass for Boron?

17
Cl
Chlorine
35.453

17

10.81 or 11

3. How many protons are in an atom of Na?

11

4. How many neutrons are in an atom of He?

2

5. How many electrons are in an atom of Cl?

17

6. How many protons plus neutrons would be in an atom of Chlorine?
7. How many neutrons are in an atom of Na?

12

8. How many protons plus neutrons are in an atom of Helium?

4.003
or 4

35.453
or 35