periodic table review be sure the following info is in your notebook or on your yellow periodic...
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Predicting Periodically Estimated values for elements #4 & #23TRANSCRIPT
Periodic Table ReviewBe sure the following info is in your notebook or on your yellow
Periodic Table
COLUMN = “GROUP”
Elements with similar chemical and physical properties, and that don’t react with each other
ROW = “PERIOD”
Elements with similar atomic masses, but chemical and physical properties go through a cycle
Predicting Periodically
• Read instructions as a class up through first paragraph under “PLOTS BY ATOMIC NUMBER 1-36” (ending with “in the rows labeled Estimate”). You’re on your own for the rest.
• Follow the instructions CAREFULLY so you don’t have to redo your work.
• You should check your work occasionally with the instructor’s key.
• Do as much as you can today. Some time will be available tomorrow.
Predicting PeriodicallyEstimated values for elements #4 & #23
Predicting PeriodicallyActual values for elements #4 & #23
Element Value MP K) BP (K) Density
(g/cm3) Radius (Å)
#4Estimate 2950
Actual 1551 3243 1.848 1.40
#23Estimate
Actual 2175 3682 6.11 1.92
Predicting PeriodicallySample GROUP Plot
Predicting PeriodicallySample GROUP Plot
WRONG !!
Predicting PeriodicallySame properties in groups (columns)Group
1
H
Li
Na
K
Rb
Cs
Group 18
He
Ne
Ar
Xe
Rn
Predicting PeriodicallyRepeating pattern of properties in periods (rows)
Row 2
Row 3
Row 4
Predicting Periodically
• NEW THEME: Structure of table is determined by structure of atoms
• TANTALIZING HINT: Atomic radius ALSO has same periods as all the other properties. Atomic radius measures size of electron cloud around atom.