1. Tuesday October 21 How many protons does Sulfur (S) have?
What is the atomic number of Calcium (Ca)?
How many electrons does Sodium (Na) have?
What is the chemical symbol for Potassium?
What element has the chemical symbol He?

2. Today’s Planner
Atoms & Periodic Table Practice

3. Today’s Goal
I can draw and label an atom.

4. Today’s Plan Review homework Number of Neutrons Practice drawing atoms

5. Neutrons - Atomic Number (Protons) # of Neutrons
Atomic Mass (Protons + Neutrons)
- Atomic Number (Protons)
# of Neutrons

6. How many neutrons? 17 Cl
35.45
18 neutrons

7. How many neutrons? 7 N
14.007
7 neutrons

8. How many neutrons? 19 K
39.098
20 neutrons

9. How many neutrons? 13 Al
26.982
14 neutrons

10. How many neutrons? 3 Li
6.941
4 neutrons

11. How many neutrons? 8 O
15.99
8 neutrons

12. Now we can draw the nucleus8 O
15.99
How many protons? 8 How many neutrons? – 8 = ~ + + + + + + + +

13. Now we can draw the nucleus2 He
4.00
How many protons? 2 How many neutrons? 4.00 – 2 = ~ + +

14. Now we can draw the nucleus3 Li
6.941
How many protons? 3 How many neutrons? – 3 = ~ 4 + + +

15. Now we can draw the nucleus6 C
12.01
How many protons? 6 How many neutrons? – 6 = ~ + + + + + +

16. Now we can draw the nucleus9 F
18.998
How many protons? 9 How many neutrons? – 9 = ~ 10 + + + + + + + + +