Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-1; AP Chem Unit 1; Pre-AP Unit 1; CCSS HSN-Q.A.1-3 and RST.11-12.1

11.20 Periodic Trends and Coulombic Attraction Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.20 Periodic Trends and Coulombic Attraction. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Periodic Trends and Coulombic Attraction: Predict and explain atomic radius, ionic radius, ionization energy, electronegativity, and electron affinity using nuclear charge, shielding, and distance. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-1; AP Chem Unit 1; Pre-AP Unit 1; CCSS HSN-Q.A.1-3 and RST.11-12.1 - Periodic Trends and Coulombic Attraction Chemistry Standards Crosswalk: National: NGSS HS-PS1-1; AP Chem Unit 1; Pre-AP Unit 1; CCSS HSN-Q.A.1-3 and RST.11-12.1. State frameworks: TX TEKS 112.43(c)(5)-(6); MA HS.CHEM.1.1; FL SC.912.P.8.3-8.4; CA/NY/NJ HS-PS1-1; GA Chemistry atomic-structure standards; VA Chemistry atomic theory 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 11.20 Periodic Trends and Coulombic Attraction skill assessments:

Problem 1Difficulty: Mastery

Two elements are in the same group. The lower element has more protons but lower first ionization energy. Which explanation best resolves the apparent contradiction?

AThe lower element must actually have fewer protons than the upper element.

BIonization energy depends only on the number of protons, so the observation is impossible.

CThe lower element has a smaller radius, making the valence electron easier to remove.

DThe lower element has greater shielding and electron-nucleus distance, which outweigh the increased nuclear charge for its valence electron.

Solution & Explanation:Down a group, added inner shells increase shielding and distance. Those factors weaken the attraction to valence electrons enough that first ionization energy decreases despite the greater nuclear charge.

Problem 2Difficulty: Mastery

From Na to Cl across period 3, which statement best connects electron affinity to Coulombic attraction while allowing for exceptions?

AElectron affinity becomes less exothermic across every period because atomic mass increases.

BElectron affinity is exactly the same as electronegativity, so there are no exceptions.

CElectron affinity generally becomes more exothermic as Z_eff increases, but sublevel stability and electron repulsion can create exceptions.

DElectron affinity depends only on the number of neutrons in the nucleus.

Solution & Explanation:Across a period, greater effective nuclear charge usually makes gaining an electron more favorable. However, electron configuration details can make the pattern irregular.

Problem 3Difficulty: Mastery

S2-, Cl-, K+, and Ca2+ are all isoelectronic with 18 electrons. Which particle has the greatest radius?

ACa2+, because a 2+ charge makes the ion largest.

BS2-, because it has the fewest protons attracting the 18-electron cloud.

CK+, because potassium is a metal and metals always have the largest ions.

DCl-, because halogens always form the largest anions in any set.

Solution & Explanation:For an isoelectronic series, fewer protons means weaker attraction for the same number of electrons. S2- has 16 protons, fewer than Cl-, K+, or Ca2+.

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Frequently Asked Questions

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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; AP Chem Unit 1; Pre-AP Unit 1; CCSS HSN-Q.A.1-3 and RST.11-12.1 (National: NGSS HS-PS1-1; AP Chem Unit 1; Pre-AP Unit 1; CCSS HSN-Q.A.1-3 and RST.11-12.1. State frameworks: TX TEKS 112.43(c)(5)-(6); MA HS.CHEM.1.1; FL SC.912.P.8.3-8.4; CA/NY/NJ HS-PS1-1; GA Chemistry atomic-structure standards; VA Chemistry atomic theory standards.).