Chapter 6Predicting Outer Electron

ConfigurationsParts 1 & 2

Electron Configurations

• 11Na

• 19K

• 16S

• 34Se

• 22Ti

• 40Zr

Period # = Outer Energy Level

Includes lanthanides

Includes actinides

Elements in the Same Group

• Elements in the same group have similar properties because they have similar electron configurations.

Sublevel Blocks of the Periodic Table

Not all periodic tables look exactly the same.

Not all periodic tables look exactly the same.

o

Blank Periodic Table

s = period # p = period #

d = (period# - 1)

f = (period# - 2)

Periodic Table and Electron Configuration

1

2

3

4

5

6

7

6

7

1

2

3

4

5

6

7

6

7

Predict the electron configuration for the last sublevel.

• 20Ca

o

Predict the electron configuration for the last sublevel.

• 20Ca

• 82Pb

o

Predict the electron configuration for the last sublevel.

• 20Ca

• 82Pb

• 47Ag o

Predict the electron configuration for the last sublevel.

• 20Ca

• 82Pb

• 47Ag

• 92U

o

© 1998 by Harcourt Brace & Company

s = periodp = period

d = (period-1)

f (period-2)67

Periodic Table and Electron Configuration

1

2

3

4

5

6

7

6

7

1

2

3

4

5

6

7

6

7

Abbreviated Electron Configurations: “A Shortcut”

© 1998 by Harcourt Brace & Company

67

Write the electron configuration for lead (Z = 82) using the periodic table.

O

Notes: Abbreviated Electron Configuations

82Pb has the following electron configuration: 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p2

Notes: Abbreviated Electron Configuations

82Pb has the following electron configuration: 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p2

54Xe has the following electron configuration: 1s22s22p63s23p64s23d104p65s24d105p6

[Ar]

1

2

3

4 5

6

7

4s2 3d10 4p2

C. Periodic Patterns

• Example – Germanium (Z = 32)

Write the electron configurations.20Ca

94Pu

77Ir

Write the electron configurations.

• 20Ca = [Ar]4s2

• 94Pu = [Rn]7s25f6

• 77Ir = [Xe]6s24f145d7

Homework

• Worksheet: Electron Configuration and the Periodic Table.• Worksheet : Predicting electron configurations Make sure you use the periodic table suggested for

your assignment or your answers may vary slightly.