Electron Configuration- Practice

Electron Configuration Practice

The Periodic Table

-Divided into different sections

-Helps to identify the energy levels of the elements

How to Write an Electron Configuration:

1. Start with the shell/period number

2. Followed by the type of orbital

3. Finally the superscript indicates the number of electrons in the orbital

Example: B = 1s² 2s² 2p¹

Expanded Periodic Table

How the f block fits into the periodic table with the other energy levels

Read the energy levels from left to right, top to bottom

Hydrogen (1s¹)

-The first element on the periodic table

-The element that starts the electron configuration levels

-1 electron on the inner most shell

Helium (1s²)

-The second element in period 1

-2 electrons on the inner most shell

-Start at H and move across the period to count the valence electrons

Beryllium (Be)

-The second element in period 2

-2 electrons on the second shell

-Start at H and move across the period to count the valence electrons

-Move down a period and count across, stopping at Be

Multiple Choice

Choose the correct electron configuration for Beryllium (Be).

• 1s¹

• 1s² 2s²

• 1s² 2s² 2p¹

Chlorine (Cl)

-The seventh element in period 3

-7 electrons on the third shell

-Start at H and move across the period to count the valence electrons

-Move down a period and count across

-Repeat, stopping at Cl

Multiple Choice

Choose the correct electron configuration for Chlorine (Cl).

• 1s² 2s² 2p¹

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s² 3p⁵

Nickel (Ni)

-The tenth element in period 4

-8 electrons in 3s & 3p + 8 electrons in 3d block

-2 electrons on the fourth shell

-Start at H and move across the period to count the valence electrons

-Move down a period and count across

-Repeat, stopping at Ni

Multiple Choice

Choose the correct electron configuration for Nickel (Ni).

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹⁰

Krypton (Kr)

-The eighteenth element in period 4

-8 electrons in 3s & 3p + 8 electrons in 3d block

-8 electrons on the fourth shell (2 in 4s & 6 in 4p)

-Start at H and move across the period to count the valence electrons

-Move down a period and count across

-Repeat, stopping at Kr

Multiple Choice

Choose the correct electron configuration for Krypton (Kr).

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s⁸ 3d⁸

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸ 4p3

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸ 4p⁶

Terbium (Tb)

-The eleventh element in period 6

-18 electrons in 4s, 4p, & 4d + 9 electrons in 4f block

-8 electrons in 5s & 5p

-2 electrons in the sixth shell

-Start at H and move across the period to count the valence electrons

-Move down a period and count across

-Repeat, stopping at Tb

Multiple Choice

Choose the correct electron configuration for Terbium (Tb).

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁹ 5p⁶ 6s²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁹

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁵