This pack covers AQA specification 6.4.1.1 and 6.4.1.2: the structure of an atom (a positively charged nucleus of protons and neutrons surrounded by negatively charged electrons), the size of an atom and its nucleus in standard form, where the mass of an atom is concentrated, electrons on energy levels and how they move when an atom absorbs or emits electromagnetic radiation, atomic number and mass number, isotopes, why atoms have no overall charge, and how atoms become positive ions.

The Topic Mastery Sheet gives the AQA statements on the structure of an atom, an original labelled diagram of a lithium-7 atom, and a table of where each particle is found and its charge. A worked example finds the radius of a nucleus from the atom’s radius in standard form. Original diagrams and a table show what happens to an electron when an atom absorbs or emits electromagnetic radiation. An annotated symbol for oxygen-16 explains atomic number and mass number, a table compares the isotopes oxygen-16 and oxygen-18, and a worked example shows how a lithium atom becomes a positive ion. An exam tip sets out what changing protons, neutrons or electrons does, a key vocabulary table gives the exact AQA terms, five common errors are corrected, and the Grade 8-9 stretch section asks how empty an atom is.

The Student Exam Practice Sheet (22 marks) has five questions. They progress from tick-box items on the size of an atom and its nucleus, a table to complete on the three particles and an explanation of why an atom has no overall charge, through a standard form calculation comparing an atom with its nucleus and a scale model, to completing a table for the isotopes of carbon, correcting a student’s claim about carbon-14 and an energy level question on absorbing and emitting radiation. The sheet ends with a 4-mark question comparing a magnesium-24 atom with a magnesium ion, marked by levels. Questions are numbered and marked in AQA style (01.1, [2 marks], Tick (✓) one box). The answer key follows AQA mark-scheme conventions (allow, ignore, do not accept, dependent marks, error carried forward) and gives the AO and specification reference for every part; the 4-mark question uses AQA’s own level descriptors.

Project the mastery sheet for a ready-made revision lesson, set the practice sheet as homework or a timed check, or use the pack for intervention and independent study. PDF and editable Word versions are both included. Written for AQA GCSE Combined Science: Trilogy (8464); content that appears only in AQA GCSE Physics (8463) is not included. All questions are original. This resource is not endorsed by or affiliated with AQA.

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