How do I revise E2E stub topic for OCR GCSE?

Always use the periodic table provided to check group and period numbers.

What exam tips are there for E2E stub topic? (2)

Show all calculation steps when determining relative atomic mass—even if the final answer is wrong, method marks are available.

What exam tips are there for E2E stub topic? (3)

When explaining trends, always reference the number of outer electrons or shells.

What mistakes should I avoid in E2E stub topic?

Confusing atomic mass with mass number.

What are common errors in E2E stub topic exams? (2)

Incorrectly filling electron shells beyond the second shell (e.g., 2,8,8 for potassium).

E2E stub topic

OCR

GCSE

This subtopic covers the fundamental principles of atomic structure, including the arrangement of protons, neutrons, and electrons, electron shells, and how atomic structure relates to the periodic table. It emphasises how understanding atomic composition explains chemical properties, trends, and bonding, providing a basis for predicting reactions and material behaviour.

Objectives

Exam Tips

Pitfalls

Key Terms

Mark Points

What You Need to Demonstrate

Key skills and knowledge for this topic

Award credit for correctly identifying the number of subatomic particles from atomic notation.
Look for accurate depiction of electron shells up to element 20.
Require a clear link between outer electron number and group number.
Accept correct working and final answer for relative atomic mass calculations.
Demonstrate understanding of why early models were replaced by new evidence.

Marking Points

Key points examiners look for in your answers

Award credit for correctly identifying the number of subatomic particles from atomic notation.
Look for accurate depiction of electron shells up to element 20.
Require a clear link between outer electron number and group number.
Accept correct working and final answer for relative atomic mass calculations.
Demonstrate understanding of why early models were replaced by new evidence.

Examiner Tips

Expert advice for maximising your marks

💡Always use the periodic table provided to check group and period numbers.
💡Show all calculation steps when determining relative atomic mass—even if the final answer is wrong, method marks are available.
💡When explaining trends, always reference the number of outer electrons or shells.
💡Be prepared to compare old and new atomic models with specific reasons for their changes.

Common Mistakes

Pitfalls to avoid in your exam answers

Confusing atomic mass with mass number.
Incorrectly filling electron shells beyond the second shell (e.g., 2,8,8 for potassium).
Assuming all atoms of an element have the same mass without considering isotopes.
Misinterpreting group number as the number of shells.

Study Guide Available

Comprehensive revision notes & examples

Read Study Guide

Key Terminology

Essential terms to know

Subatomic particles

Electron configuration

Periodic table trends

Atomic number and mass

Isotopes and relative atomic mass

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Practice questions tailored to this topic

E2E stub topic

What You Need to Demonstrate

Marking Points

Examiner Tips

Common Mistakes

Study Guide Available

Key Terminology

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Related Topics in OCR GCSE Chemistry

Topic 7 is a practical-based topic

Topic C1: Particles

Topic C2: Elements, compounds and mixtures

Topic C3: Chemical reactions