chapter 6.2
TRANSCRIPT
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Chapter 6: The Periodic Table
Section 2:Classifying the Elements
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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…
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J.W. Dobereiner...◦ Triads
Dimitri Mendeleev...◦ Increasing atomic mass
Modern periodic table...◦ Increasing atomic number
Elemental Organizers
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Periods: Rows in the table Groups: Vertical columns
◦ Groups are numbered 1-18◦ Some groups have special names...
Features of the Table
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One electron in highest occupied energy level
Alkali Metals (Group 1)
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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...
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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...
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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...
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Blocks of Elements
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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?
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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…
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Homework