1. Catalyst

2. Objective SWBAT explain how the periodic table is set up.
SWBAT identify & calculate atomic number.
SWBAT identify & calculate atomic mass / mass number.

3. Periodic Table Set Up

4. Elements
Elements have a characteristic (unique) set of chemical & physical properties.
First organized into “periodic table” by Russian Chemist Mendeleev

6. Periodic Table Set Up 10.23.2008 Elements
Have unique chem. & physical properties
Organized into periodic table

7. Elements
There is a universally understood symbol for each element. An element is represented in one of 2 ways:
1. A capital letter
Boron:
Sulfur:
Potassium:

8. Elements
There is a universally understood symbol for each element. An element is represented in one of 2 ways:
1. A capital letter
Boron: B
Sulfur: S
Potassium: K (from the Latin: Kalium)

9. Periodic Table Set Up 10.23.2008 Elements Symbols
Have unique chem. & physical properties
Organized into periodic table
2 ways to represent element: 1. Capital letter (e.g. B = Boron, S = Sulfur, Potassium = K)

10. Elements
There is a universally understood symbol for each element. An element is represented in one of 2 ways:
2. A capital letter + lowercase letter
Calcium:
Magnesium:
Silicon:

11. Elements
There is a universally understood symbol for each element. An element is represented in one of 2 ways:
2. A capital letter + lowercase letter
Calcium: Ca
Magnesium: Mg
Silicon: Si

12. Periodic Table Set Up 10.23.2008 Elements Symbols
Have unique chem. & physical properties
Organized into periodic table
2 ways to represent element: 1. Capital letter (e.g. B = Boron, S = Sulfur, Potassium = K) 2. Capital letter + lowercase letter (e.g. Ca = Calcium, Mg = Magnesium, Si = Silicon)

13. Reading Periodic Table
Atomic #
Symbol
Name
Atomic Mass / Mass #

14. Periodic Table Set Up 10.23.2008 Symbols Reading Periodic Table
- 2 ways to represent element: 1. Capital letter (e.g. B = Boron, S = Sulfur, Potassium = K) 2. Capital letter + lowercase letter (e.g. Ca = Calcium, Mg = Magnesium, Si = Silicon)
Atomic #
Symbol
Atomic Mass / Mass #
Name

15. Atomic #
Elements are distinguished from each other in the periodic table based on the number of protons in the nucleus

16. Atomic # is equal to the number of protons (p+) in the nucleus.

17. Periodic Table Set Up 10.23.2008 Reading Periodic Table Atomic #
Atomic # = # protons
Atomic #
Symbol
Atomic Mass / Mass #
Name

18. Atomic # is equal to the number of protons (p+) in the nucleus.
Uncharged atoms have the same # of protons & electrons.

19. Periodic Table Set Up 10.23.2008 Reading Periodic Table Atomic #
Atomic # = # protons
In uncharged atoms, # protons = # electrons
Atomic #
Symbol
Atomic Mass / Mass #
Name

20. Atomic # The atomic # is 6. What is the number of protons? 6 protons
What is the # of electrons?
6 electrons

21. Periodic Table Set Up 10.23.2008 Reading Periodic Table Atomic #
Atomic # = # protons
In uncharged atoms, # protons = # electrons
Ex. Carbon: Atomic # = 6, # p+ = 6, # e- = 6
Atomic #
Symbol
Atomic Mass / Mass #
Name

22. Mass # Another way to distinguish elements is by their total mass.
Mass # = # protons + # neutrons
Why doesn’t the mass # include the electrons?
Electrons have an extremely small mass that barely contributes to the overall mass!

23. Periodic Table Set Up 10.23.2008 Atomic # Mass # Atomic # = # protons
In uncharged atoms, # protons = # electrons
Ex. Carbon: Atomic # = 6, # p+ = 6, # e- = 6
Mass # = # protons + # neutrons

24. Ex. 1: If an atom has 5 protons and 5 neutrons, what is the mass #?
Mass # = 5p+ + 5n0 = 10

25. Periodic Table Set Up 10.23.2008 Atomic # Mass # Atomic # = # protons
In uncharged atoms, # protons = # electrons
Ex. Carbon: Atomic # = 6, # p+ = 6, # e- = 6
Mass # = # protons + # neutrons
Ex 1: 5p+ , 5n0  mass # = 10

26. # neutrons = mass # - # protons = 17-8 = 9
Ex. 2: If an atom has a mass # of 17 and has 8 protons, what is the number of neutrons in the atom?
# neutrons = mass # - # protons = 17-8 = 9

27. Periodic Table Set Up 10.23.2008 Atomic # Mass # Atomic # = # protons
In uncharged atoms, # protons = # electrons
Ex. Carbon: Atomic # = 6, # p+ = 6, # e- = 6
Mass # = # protons + # neutrons
Ex 1: 5p+ , 5n0  mass # = 10
Ex 2: Mass # = 17, 8p+  #n0 = 17-8=9

28. Mass #
Ex. 3: If an atom has a mass # of 22 and an atomic # of 11, what is the number of neutrons?
Atomic # = # protons = 11
# neutrons = mass # - # protons = = 11

29. Periodic Table Set Up 10.23.2008 Atomic # Mass # Atomic # = # protons
In uncharged atoms, # protons = # electrons
Ex. Carbon: Atomic # = 6, # p+ = 6, # e- = 6
Mass # = # protons + # neutrons
Ex 1: 5p+ , 5n0  mass # = 10
Ex 2: Mass # = 17, 8p+  #n0 = 17-8=9
Ex 3: Mass # = 22, Atomic # = 11  #n0 = = 11

30. Summary
Take a few minutes to make a summary of today’s notes.
When done, work on your HW Packet!