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Ch.9 - Chemical Bonding I: The Lewis Model
Tro - Chemistry: A Molecular Approach 4th Edition
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Tutti i libri di testoTro 4th EditionCh.9 - Chemical Bonding I: The Lewis ModelProblema 63a
Capitolo 9, Problema 63a

Write a Lewis structure that obeys the octet rule for each molecule or ion. Include resonance structures if necessary and assign formal charges to each atom. a. SeO2

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Step 1: Count the total number of valence electrons. Selenium (Se) has 6 valence electrons, and each oxygen (O) has 6 valence electrons. Therefore, SeO_2 has a total of 6 + 2(6) = 18 valence electrons.
Step 2: Determine the central atom. Selenium (Se) is less electronegative than oxygen, so it will be the central atom.
Step 3: Connect the atoms with single bonds. Place Se in the center and connect it to each O atom with a single bond. This uses 4 electrons (2 for each bond), leaving 14 electrons.
Step 4: Distribute the remaining electrons to satisfy the octet rule. Start by placing lone pairs on the oxygen atoms to complete their octets. Each oxygen will need 6 more electrons (3 lone pairs), using up 12 electrons, leaving 2 electrons.
Step 5: Place the remaining electrons on the central atom (Se). Now, check if all atoms have complete octets. If not, consider forming double bonds between Se and O atoms to satisfy the octet rule for all atoms. Assign formal charges to each atom and check for possible resonance structures.

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Lewis Structures

Lewis structures are diagrams that represent the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They use dots to represent valence electrons and lines to represent bonds. Understanding how to draw Lewis structures is essential for visualizing molecular geometry and predicting reactivity.
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Lewis Dot Structures: Ions

Octet Rule

The octet rule is a chemical rule of thumb that states atoms tend to bond in such a way that they each have eight electrons in their valence shell, achieving a stable electron configuration similar to that of noble gases. This rule helps predict the arrangement of electrons in molecules and is crucial for determining the validity of a Lewis structure.
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Octet Rule

Formal Charge

Formal charge is a concept used to determine the charge of an atom in a molecule based on its valence electrons, the number of bonds it forms, and the number of lone electrons it possesses. Calculating formal charges helps assess the stability of a Lewis structure and identify the most favorable resonance structures, ensuring that the overall charge of the molecule is accurately represented.
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Formal Charge
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