1. Ions 11/3/2008
Use your periodic table to answer the following questions about Sodium (Na) and Chlorine (Cl):
What is the atomic number?
What is the atomic mass?
How many protons do they have?
How many electrons do they have?
How many neutrons do they have?

2. Review Electrons Protons = electrons
In an uncharged atom, the number of protons is equal to the number of ________________.
Electrons
An uncharged atoms has NO charge. Why?
Protons = electrons

3. electrons Protons = electrons Ions 10/30/08 Uncharged Atoms
NO charge (zero charge)
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons

4. Ions Electrons can be added or removed from an atom.
If the number of electrons is not equal to the number of protons, the atom is no longer uncharged

5. Ions The ions of an element have an overall charge
The number of protons does not equal the number of electrons
Atomic number always tells us the number of protons
The number of electrons is what changes

6. electrons Protons = electrons Ions 10/30/08 Uncharged Atoms
NO charge (zero charge)
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
Ions
Ions have an overall charge
Protons  electrons
# of protons = atomic number
# of electrons changes

7. Ions
Overall Charge = # protons - # electrons
If an ion has more protons than electrons, the overall charge will be positive.
If an ion has more electrons than protons, the overall charge will be negative.

8. electrons Protons = electrons Ions 10/30/08 Uncharged Atoms
NO charge (zero charge)
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
Ions
Ions have an overall charge
Protons  electrons
# of protons = atomic number
# of electrons changes
Overall Charge
Overall charge = # protons - # electrons
protons  electrons overall charge is positive
protons  electron  overall charge is negative

9. electrons Protons = electrons Ions 10/30/08
Overall Charge Examples
Ex. 1: If an atom has 18 protons, 18 neutrons, and 17 electrons, what will the overall charge be?
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
Overall charge = protons – electrons
= 18p+ - 17e-
= +1
Ex. 2: If an atom has 18 protons, 18 neutrons, and 19 electrons, what will the overall charge be?
Overall charge = protons – electrons
= 18p+ - 19e-
= -1

10. electrons Protons = electrons Ions 10/30/08
Overall Charge Examples
Ex. 3: If an atom has 18 protons, 18 neutrons, and 18 electrons, what will the overall charge be?
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
Overall charge = protons – electrons
= 18p+ - 18e-
= 0
NOT an ion (protons = electrons)

11. Ions are abbreviated with the element symbol and the charge.
Ex. 1: An ion of Potassium (K) has a +1 charge: it is abbreviated as K+.
Ex. 2: An ion of Iodine (I) has a -1 charge: it is abbreviated as

12. Ions are abbreviated with the element symbol and the charge.
Ex. 1: An ion of Potassium (K) has a +1 charge: it is abbreviated as K+.
Ex. 2: An ion of Iodine (I) has a -1 charge: it is abbreviated as I-

13. electrons Protons = electrons Ions 10/30/08
Overall Charge Examples
Ex. 3: If an atom has 18 protons, 18 neutrons, and 18 electrons, what will the overall charge be?
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
Overall charge = protons – electrons
Overall charge = 18p+ - 18e-
Overall charge = 0
NOT an ion (protons = electrons)
Symbols for ions
Element symbol + charge
Potassium (K) with a +1 charge = K+
Iodine (I) with a -1charge = I-

14. Ions
An ion of Sulfur has a -2 charge: it is abbreviated as____.

15. Ions An ion of Sulfur has a -2 charge: it is abbreviated as S-2.
An ion of Calcium has a +2 charge: it is abbreviated as _____

16. Ions An ion of Sulfur has a -2 charge: it is abbreviated as S-2.
An ion of Calcium has a +2 charge: it is abbreviated as Ca+2

17. Calculating Subatomic Particles
Atomic number = protons
# Electrons = # Protons – Overall Charge

18. electrons Protons = electrons Ions 10/30/08
Examples
Ex. 1: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of +1, find the following information:
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
# Protons:

19. electrons Protons = electrons Ions 10/30/08
Examples
Ex. 1: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of +1, find the following information:
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
# Protons: 13
# Electrons:

20. electrons Protons = electrons Ions 10/30/08
Examples
Ex. 1: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of +1, find the following information:
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
# Protons: 13
# Electrons: # protons – charge
13 – (1) 12

21. electrons Protons = electrons Ions 10/30/08
Examples
Ex. 1: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of +1, find the following information:
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
# Protons: 13
# Electrons: # protons – charge
13 – (1) 12
# neutrons:

22. electrons Protons = electrons Ions 10/30/08
Examples
Ex. 1: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of +1, find the following information:
In an uncharged atom, the number of protons is the same as the number of ____________.
electrons
An uncharged atom has NO charge. Why?
Protons = electrons
# Protons: 13
# Electrons: # protons – charge
13 – (1) 12
# neutrons: mass # - # protons
26 – 13 13

23. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons:
# Electrons:
# Neutrons:

24. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons:
# Neutrons:

25. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons:

26. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons: 13

27. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons: 13
Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information:
# Protons:
# Electrons:
# Neutrons:

28. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons: 13
Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information:
# Electrons:
# Neutrons:

29. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons: 13
Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information:
# Electrons: 14
# Neutrons:

30. Examples (Left Page)
Ex. 2: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -2, find the following information:
# Protons: 13
# Electrons: 15
# Neutrons: 13
Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information:
# Electrons: 14

31. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #:
Overall Charge:
# p+:
#e-:
# n0:
Mass #:

32. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge:
# p+:
#e-:
# n0:
Mass #:

33. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge: +1
# p+:
#e-:
# n0:
Mass #:

34. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge: +1
# p+: 19
#e-:
# n0:
Mass #:

35. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge: +1
# p+: 19
#e-: 18
# n0:
Mass #:

36. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge: +1
# p+: 19
#e-: 18
# n0: 20
Mass #:

37. Examples (Left Page)
Ex. 4: Using your periodic table, find the following information for K+:
Atomic #: 19
Overall Charge: +1
# p+: 19
#e-: 18
# n0: 20
Mass #: 39

38. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #:
Overall Charge:
# p+:
#e-:
# n0:
Mass #:

39. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge:
# p+:
#e-:
# n0:
Mass #:

40. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge: -2
# p+:
#e-:
# n0:
Mass #:

41. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge: -2
# p+: 16
#e-:
# n0:
Mass #:

42. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge: -2
# p+: 16
#e-: 18
# n0:
Mass #:

43. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge: -2
# p+: 16
#e-: 18
# n0: 16
Mass #:

44. Examples (Left Page)
Using your periodic table, find the following information for S2-:
Atomic #: 16
Overall Charge: -2
# p+: 16
#e-: 18
# n0: 16
Mass #: 32

45. SUMMARY
Take 3 minutes to write a summary of today’s notes (I will be stamping).
Work on your HW Packet – ions section!