1. Chemistry Part 5
More on Atoms and Ions

2. Practice
What is the number of protons for Cobalt? 27

3. Practice
What is the atomic mass for Strontium?
87.62

4. Practice
What is the number of neutrons for Germanium?
73 – 32 41

5. Practice
Draw a Bohr diagram for a Lithium atom.

6. Practice
Draw a Lewis diagram for a Lithium atom.

7. Practice
Draw a Bohr diagram for a Fluorine atom.

8. Practice
Draw a Lewis diagram for a Fluorine atom.

9. Practice
Which atom is in period 2, group 15?
Nitrogen

10. Practice
Which atom is in period 5, group 11?
Silver

11. Practice Which group number can you find the alkaline earth metals?

12. Remember: Cation: Positively charged ion. Most metals. Use atom name.
When an atom loses electrons it is a positive ion.

13. Ions Anion: Negatively charged ion. Most non-metals. Use “ide”.
When an atom gains electrons it is a negative ion.

14. Practice
Draw a Lewis diagram for a Lithium ion.

15. Practice
Draw a Lewis diagram for a Fluoride ion.

16. Practice
What is the name for As3- ?
Arsenide ion

17. Practice
What is the name for Mg2+ ?
Magnesium ion.

18. Practice
Determine the charge for an Aluminum ion.
Al3+

19. Practice
Determine the charge for a Sulfide ion.
S2-

20. Practice
Worksheet
Page 97 # 11 – 15, 18, 19, 21
Page 109 # 4, 9