Draw all possible resonance structures for each of these...

Key Concepts

Formal Charge

Formal charge is a calculated charge assigned to atoms in a molecule, based on the assumption that electrons in all chemical bonds are shared equally. It is determined by comparing the number of valence electrons an atom has in its free state with the number it 'owns' in the molecule. Calculating formal charges helps identify the most stable Lewis structure among possible resonance forms.

Electron Counting

Electron counting is the process of tallying the total number of valence electrons available in a molecule or ion. This concept ensures that electrons are correctly allocated in Lewis structures and resonance forms, which is essential for accurately calculating formal charges and satisfying the octet (or duet) rule for the atoms involved.

Resonance Structures

Resonance structures are multiple valid Lewis structures that represent the same molecule or ion. They show different possible arrangements of electrons, especially ? electrons or lone pairs, while the positions of the atoms remain fixed. These structures are used to represent electron delocalization and help in understanding the molecule's reactivity and stability.

Lewis Structures

Lewis structures are diagrams that represent the valence electrons of atoms within a molecule. They depict atoms, bonds, and lone pairs of electrons, serving as a blueprint for understanding molecular structure. When drawing these structures, the total number of valence electrons is distributed so that atoms (usually following the octet rule) achieve a stable electron configuration.