Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-1, HS-PS1-2, HS-PS1-3; AP Chem Unit 2; Pre-AP Unit 2; CCSS RST.11-12.7 and HSN-Q.A.1

11.40 Formal Charge, Expanded Octets, and Exceptions Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.40 Formal Charge, Expanded Octets, and Exceptions. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Formal Charge, Expanded Octets, and Exceptions: Evaluate Lewis structures using formal charge and identify valid exceptions such as radicals, incomplete octets, and expanded octets. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-1, HS-PS1-2, HS-PS1-3; AP Chem Unit 2; Pre-AP Unit 2; CCSS RST.11-12.7 and HSN-Q.A.1 - Formal Charge, Expanded Octets, and Exceptions Chemistry Standards Crosswalk: National: NGSS HS-PS1-1, HS-PS1-2, HS-PS1-3; AP Chem Unit 2; Pre-AP Unit 2; CCSS RST.11-12.7 and HSN-Q.A.1. State frameworks: TX TEKS 112.43(c)(7); MA HS.CHEM.1.1; FL SC.912.P.8.6; CA/NY/NJ HS-PS1-2/3; GA Chemistry bonding standards; VA Chemistry bonding standards.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Chemistry

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 11.40 Formal Charge, Expanded Octets, and Exceptions skill assessments:

Problem 1Difficulty: Mastery

A review card lists XeF2, BF3, and NO2. Which matching of Lewis-structure exceptions is correct?

AXeF2 incomplete octet, BF3 radical, NO2 expanded octet

BXeF2 radical, BF3 expanded octet, NO2 incomplete octet

CAll three are ordinary octet structures with no exceptions

DXeF2 expanded octet, BF3 incomplete octet, NO2 radical

Solution & Explanation:XeF2 has five electron pairs around xenon, BF3 has only six electrons around boron, and NO2 has an odd number of valence electrons.

Problem 2Difficulty: Mastery

A table lists three possible central-atom choices for a Lewis structure: carbon with five bonds, sulfur with six bonds, and boron with three bonds. Which evaluation is best?

AAll three are valid expanded-octet examples.

BAll three are invalid because central atoms must have exactly four bonds.

CCarbon with five bonds is invalid; sulfur with six bonds is expanded; boron with three bonds is incomplete.

DCarbon and boron are expanded, while sulfur is incomplete.

Solution & Explanation:Carbon is period 2 and cannot have five bonds. Sulfur can be shown expanded in period 3, and boron commonly has an incomplete octet with three bonds.

Problem 3Difficulty: Mastery

In nitrate, NO3-, why do the common resonance contributors keep nitrogen at formal charge +1 instead of expanding nitrogen to remove charge?

ANitrogen has no valence electrons available for bonding.

BNitrogen is limited to an octet, so formal charge cannot be lowered by adding another N=O bond.

COxygen cannot carry negative formal charge in any ion.

DNitrate has an odd number of electrons and must be a radical.

Solution & Explanation:Nitrate has 24 valence electrons and is not a radical. The +1 on nitrogen and -1 charges on oxygens are retained because nitrogen cannot exceed eight electrons.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard NGSS HS-PS1-1, HS-PS1-2, HS-PS1-3; AP Chem Unit 2; Pre-AP Unit 2; CCSS RST.11-12.7 and HSN-Q.A.1 (National: NGSS HS-PS1-1, HS-PS1-2, HS-PS1-3; AP Chem Unit 2; Pre-AP Unit 2; CCSS RST.11-12.7 and HSN-Q.A.1. State frameworks: TX TEKS 112.43(c)(7); MA HS.CHEM.1.1; FL SC.912.P.8.6; CA/NY/NJ HS-PS1-2/3; GA Chemistry bonding standards; VA Chemistry bonding standards.).