BrainChildren ChemistryPreview
Open in TheBrain

Formal Charge Problems (4)

Formal Charge Problems (4) - N3

Video Thumbnail

Introduction

This video explains how to calculate the formal charge for each nitrogen atom in the azide ion (N3-). The process involves determining the number of bonding and non-bonding electrons for each atom and using the formal charge formula.

Main Points/Arguments

- Formula: Formal Charge = (Valence electrons in neutral atom) - (1/2 number of bonding electrons) - (Number of non-bonding electrons)

- This formula helps assign the charge to specific atoms within a molecule.

- Left Nitrogen Atom:

    - **Bonding Electrons:** 4 (two bonds).
    - **Non-Bonding Electrons:** 4 (two lone pairs).
    - **Calculation:** 5 (valence electrons) - (1/2 * 4) - 4 = -1.
    - **Conclusion:** Nitrogen has a formal charge of -1.

- Middle Nitrogen Atom:

    - **Bonding Electrons:** 8 (four bonds).
    - **Non-Bonding Electrons:** 0.
    - **Calculation:** 5 (valence electrons) - (1/2 * 8) - 0 = +1.
    - **Conclusion:** Nitrogen has a formal charge of +1.

- Right Nitrogen Atom:

    - **Bonding Electrons:** 4 (two bonds).
    - **Non-Bonding Electrons:** 4 (two lone pairs).
    - **Calculation:** 5 (valence electrons) - (1/2 * 4) - 4 = -1.
    - **Conclusion:** Nitrogen has a formal charge of -1.

Examples or Evidence

- The azide ion consists of three nitrogen atoms.

- The left and right nitrogen atoms each have a formal charge of -1, while the middle nitrogen atom has a formal charge of +1.

- The overall charge of the azide ion is -1, making it an anion.

Additional Insights or Context

- The azide ion (N3-) is known for its high reactivity and is often used in organic synthesis and as a propellant.

- It plays a role in substitution reactions and is sometimes abbreviated as N3-.

Conclusion

The video demonstrates the application of the formal charge formula to the azide ion, highlighting how to calculate and assign charges to specific atoms. Understanding formal charges is essential for analyzing molecular structure and reactivity.

Attachments