Chapter 6

Predicting Outer Electron Configurations

Part 2

© 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] 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 : Predicting electron configurations Make sure you use the periodic table

suggested for your assignment or your answers may vary slightly.