Write the Lewis formula for the ions (a) PCl6^- (b) I3^- (c) SiF6^- (d) IO2 F2^-

Name: Problem 27, Chapter 7: General Chemistry
Uploaded: 2021-10-12T04:29:16-08:00
Duration: 3 min 39 s
Channel: Ronald Prasad
Description: Write the Lewis formula for the ions (a) PCl6^- (b) I3^- (c) SiF6^- (d) IO2 F2^-

step 1 Let's write the Lewis formula for each of the following ions. For A, we have X minus, phosphorus

Write the Lewis formula for the ions (a) PCl6^- (b) I3^- (c)...

Key Concepts

Lewis Structure

Lewis structures are diagrams that represent the valence electrons of atoms within a molecule, ion, or polyatomic species. They show the arrangement of electrons in bonding pairs (shared between atoms) and lone pairs (nonbonding electrons), thereby illustrating the connectivity and potential reactivity of the species.

Electron Counting

Electron counting is a crucial concept in constructing accurate Lewis structures. It involves summing the valence electrons of all atoms in the molecule and adjusting for any overall charge. This step ensures that the total number of electrons used in the Lewis structure equals the available electron count, including extra electrons for negatively charged ions.

Formal Charges

Assigning formal charges helps determine the most stable Lewis structure by calculating the difference between the number of valence electrons in an isolated atom and the number of electrons assigned to it in the Lewis structure. Minimizing formal charges often leads to the most favorable distribution of electrons, which is particularly important when drawing structures of ions.

Octet Rule and Expanded Octet

The octet rule states that atoms tend to form bonds in such a way that they have eight electrons in their valence shell, resembling the electron configuration of noble gases. However, elements in the third period and beyond can have expanded octets, meaning they can accommodate more than eight electrons. This concept is essential when constructing the Lewis structures of certain polyatomic ions involving such atoms.

Polyatomic Ions

Polyatomic ions are charged entities composed of two or more atoms bonded together. Their Lewis structures must account for the overall charge and the distribution of electrons among the atoms, often requiring adjustments in electron counting and formal charge calculations to accurately reflect the ion's electron configuration.

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