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Chapter 6: The Periodic Table
Section 2:Classifying the Elements
Relate families of elements to groups on the periodic table;
Explain how common electron configurations relate to properties of element families; and
Identify properties that can be shared by groups of elements.
Students will be able to…
J.W. Dobereiner...◦ Triads
Dimitri Mendeleev...◦ Increasing atomic mass
Modern periodic table...◦ Increasing atomic number
Elemental Organizers
Periods: Rows in the table Groups: Vertical columns
◦ Groups are numbered 1-18◦ Some groups have special names...
Features of the Table
One electron in highest occupied energy level
Alkali Metals (Group 1)
Alkaline Earth Metals (Group 2)◦ Two electrons in highest occupied energy level◦ ns2
Chalcogens (Group 16)◦ Six electrons in highest occupied energy level◦ ns2np4
Halogens (Group 17)◦ Seven electrons in highest occupied energy level◦ ns2np5
Other named groups...
Noble gases (Group 18)◦ Eight electrons in highest occupied energy level◦ Full s and p sublevels
The “cool” family that lives at the end of the street...
Transition metals◦ Highest occupied s sublevel and a nearby d
sublevel contain electrons◦ In d-block of table
Inner transition metals◦ Highest occupied s sublevel and a nearby f
sublevel generally contain electrons◦ In f-block of table
Transition elements: the middle children...
Blocks of Elements
Not undiscovered elements Each period represents an energy level Each energy level adds a new sublevel Properties repeat based on electron
configurations Gaps allow for groups with common
configurations to be in same columns
Why the big gaps?
Relate families of elements to groups on the periodic table?
Explain how common electron configurations relate to properties of element families?
Distinguish representative elements and transition metals?
Objectives: Can you…
Page 167, # 8-15
Homework