Mastering Electron Configurations and Atomic Structure

The video tutorial provides a step-by-step guide on writing electron configurations for elements and ions. It begins with nitrogen, explaining the basics of electron configuration and the significance of energy levels and sublevels. The tutorial then covers aluminum, demonstrating how to write its electron configuration. It proceeds to discuss the Fe2+ ion, emphasizing the importance of considering the parent atom's configuration before adjusting for ions. Finally, the video explains the electron configuration for the chloride ion, highlighting the differences between transition and non-transition metals.

What is the atomic number of nitrogen?

• 5

• 8

• 6

• 7

How many electrons can the 2p sublevel hold?

• 2

• 4

• 6

• 8

What is the electron configuration for an atom of aluminum?

• 1s2 2s2 2p6 3s2 3p1

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s1

How many electrons does an Fe2+ ion have?

• 30

• 28

• 26

• 24

Which sublevel do you remove electrons from first when forming a positive ion?

• 4s

• 3d

• 2p

• 1s

What is the electron configuration for the Fe2+ ion?

• 1s2 2s2 2p6 3s2 3p6 3d6

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p6 3s2 3p6 3d4

• 1s2 2s2 2p6 3s2 3p6 4s0

How many electrons does a chloride ion have?

• 16

• 17

• 18

• 19

What is the electron configuration for a chloride ion?

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p6

For non-transition metal ions, what is the best approach to write their electron configuration?

• Start from the atom and adjust

• Directly use the ion's electron count

• Use the atomic mass

• Use the atomic number

What should you do when writing the electron configuration for a negatively charged ion?

• Subtract electrons

• Add electrons

• Add protons

• Subtract protons