Several Lewis structures can be written for perbromate ion, BrO4^-, the central Br with all sing

step 1 of a covalent bond just allows for non -metals to obey the octet rule and become more stable as

Several Lewis structures can be written for perbromate ion,...

Several Lewis structures can be written for perbromate ion, $\mathrm{BrO}_{4}^{-},$ the central $\mathrm{Br}$ with all single $\mathrm{Br}-\mathrm{O}$ bonds, or with one, two, or three $\mathrm{Br}=\mathrm{O}$ double bonds. Draw the Lewis structures of these possible resonance structures, and use formal charges to predict which makes the greatest contribution to the resonance hybrid.

Key Concepts

Formal Charges

Formal charges are a bookkeeping tool used to estimate the charge distribution within a molecule or ion by comparing the number of valence electrons an atom has in the free state to the number of electrons assigned to it in a particular Lewis structure. They help in assessing the relative stability of different resonance forms, with structures having minimal formal charges generally being more stable.

Expanded Octet

The concept of an expanded octet refers to the ability of atoms in the third period and beyond, such as bromine, to accommodate more than eight electrons around them. It is key to understanding the bonding in molecules where such atoms form more than four bonds or distribute electrons in resonance structures.

Lewis Structures

Lewis structures are diagrams that represent the bonding between atoms and the lone pairs of electrons in a molecule or ion. They serve as a basic framework for visualizing the connectivity of atoms and the distribution of electrons, which is essential for understanding molecular geometry and reactivity.

Resonance Structures

Resonance structures are multiple valid Lewis structures for a single molecule or ion that differ only in the position of electrons, not the arrangement of atoms. The true electronic structure is best described by a resonance hybrid, which is an average of these contributing structures.

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