Aligned to Edexcel GCSE Chemistry (Separate Science) – SC3b Atomic Number and Mass Number, this Student Topic Mastery Sheet is designed to support exam success through clear explanations, worked examples and targeted exam practice.

This resource focuses on the calculation and interpretation skills students need to secure marks on questions involving subatomic particles and isotopes.

Includes:

• Clear explanation of atomic number and mass number
• Where mass is found in an atom (nucleus focus)
• How to calculate numbers of protons, neutrons and electrons
• Worked calculation examples
• Clear explanation of isotopes
• Exam-style questions with concise model answers
• Common errors and misconceptions to prevent mark loss

Ideal for:

• GCSE revision and retrieval practice
• Cover lessons (print-and-go)
• Intervention sessions
• Homework and independent study
• Supporting non-specialist teachers

Curriculum alignment:

• Edexcel GCSE Chemistry (Separate Science)
• Topic: SC3b – Atomic Number and Mass Number

Format:

• Printable PDF
• Designed for classroom and revision use