This SC3 Student Topic Mastery Bundle covers the full Atomic Structure section of the Edexcel GCSE Chemistry (Separate Science) specification.

These visually structured, exam-focused mastery sheets are designed to help students secure marks by clearly explaining subatomic particles, atomic number and mass number, isotopes, and relative atomic mass calculations.

Each topic is presented in a concise, student-friendly format ideal for revision, intervention, and cover lessons.

Topics Included

SC3a Structure of an Atom

• Subatomic particles (protons, neutrons, electrons)
• Charges, relative masses and locations
• Why atoms have no overall charge
• Atomic models and how they changed with evidence

SC3b Atomic Number and Mass Number

• Calculating protons, neutrons and electrons
• Atomic number vs mass number
• Worked examples and exam calculations

SC3c Isotopes

• Definition of isotopes
• Isotope notation
• Chlorine isotope examples
• Relative atomic mass (weighted mean)
• Chemical vs physical properties

What’s Included in Each Topic

• Clear, exam-ready explanations aligned to Edexcel mark schemes
• Key definitions and calculation rules
• Worked examples
• Exam-style questions with concise model answers
• Common misconceptions and examiner traps

Ideal for:

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

Curriculum Alignment

• Exam board: Edexcel
• Qualification: GCSE Chemistry (Separate Science)
• Specification section: SC3 Atomic Structure

Format

• Printable PDFs
• Designed for classroom use and independent revision
• Consistent layout and exam-focused structure across all topics