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.