SP6b Inside Atoms | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP6b, covering the complete Edexcel Separate Science Physics specification for subatomic particle properties, atomic notation and isotopes (P6.3–P6.6).

Topic Mastery Sheet covers the relative masses and charges of protons (+1, mass 1), neutrons (0, mass 1), electrons (−1, negligible) and positrons (+1, negligible) in a reference table; the ᴬ_ZX atomic notation with worked examples showing how to calculate the number of each particle from A and Z; the definition of an isotope (same Z, different A - same element, different number of neutrons); and a comparison table of carbon-12 and carbon-14 illustrating how isotopes differ. The explanation of why a neutral atom has zero overall charge (proton count equals electron count) is developed rather than stated.
Student Exam Practice Sheet includes a proton charge/mass MCQ; a two-part isotope question requiring the definition of isotope (using the words “atom”, “protons” and “neutrons” as specified in the mark scheme) and completion of a particle table for carbon-14; and a MCQ on what is produced when an electron is removed from a neutral atom. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme specifying that the isotope definition requires both “same number of protons” and “different number of neutrons” for both marks, and that carbon-14 has 6 protons, 6 electrons and 8 neutrons (not 14 neutrons).

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