Textbook Question
Write the Lewis structure for each molecule or ion. a. N2H2 b. N2H4 c. C2H2
Ch.9 - Chemical Bonding I: The Lewis Model
Chapter 9, Problem 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
Verified step by step guidance1
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.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
12mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
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.
Recommended video:
Guided course
04:28
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.
Recommended video:
Guided course
01:27Octet 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.
Recommended video:
Guided course
01:53Formal Charge
Related Practice
Textbook Question
Write the Lewis structure for each molecule or ion. d. C2H4
Textbook Question
Write the Lewis structure for each molecule or ion. a. H3COCH3
Textbook Question
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. b. CO32– c. ClO– d. NO2–
Textbook Question
Write a Lewis structure that obeys the octet rule for each ion. Include resonance structures if necessary and assign formal charges to each atom. a. ClO3- b. ClO4- c. NO3- d. NH4+
Textbook Question
Use formal charges to identify the better Lewis structure.