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Create a Table
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ChemCatalyst
• In 1889 a Russian chemistry teacher created an organized table of the elements. At the time only 63 different elements were known. Below is a reproduction of that table.
– What do you think the numbers represent?
(cont.)
The Big Question
– How did Mendeleyev organize the elements?
You will be able to:
– Explain how the periodic table of elements is organized.
– Dimitri Mendeleyev is credited with organizing the elements into the first periodic table.
– The main properties that Mendeleyev used to sort the elements were reactivity with one another and a number describing the atomic weight of each element.
Notes
Activity
• Purpose: The goal of this lesson is to acquaint you with Mendeleyev’s organization of the elements by allowing you to create your own table from the patterns you see in the elements.
Making Sense
• Below are five possible cards for the
element germanium. Where does
germanium belong in the table? Which
card seems most accurate to you? What
is your reasoning?
(cont.)
Germanium
Ge62.7
Germanium
Ge62.7
Germanium
Ge66.0
Germanium
Ge72.6
A B C
D E
Germanium
Ge72.6
(cont.)
– What would you add to the three empty
corners to complete the card?
Germanium
Ge
(cont.)
(cont.)
Completed Table(cont.)
Check-In– Which of the following elements would
you find in the same group on the periodic table? Explain your thinking.
CadmiumCd
Moderately soft, silvery solid,
metal
React very slowly with water
Found inCdCl2 (s)
ZincZn
Moderately hard, silvery solid,
metal
Reacts very slowly with water
Found in ZnCl2 (s)
IodineI
Purple solid, nonmetal
Reacts slowly with metals
Found inICl (s)
MercuryHg
Silvery liquid, metal
Does not react with water
Found inHgCl2 (s)
Wrap-Up
– Mendeleyev organized the periodic table based on the properties of the elements.
– Mendeleyev’s arrangement of the elements helped to predict the existence of undiscovered elements.
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