Almost everything else in GCSE Chemistry depends on what you learn here. How an atom is built, and in particular how its electrons are arranged, is what decides how an element behaves and where it sits on the periodic table. Get that straight now and the rest of the course becomes much easier to follow.
🧭 How this topic splits by tier
Most of C1 is for everyone — only a few parts are tier-specific, so check what your tier needs:
- Everyone — atoms, elements and compounds; word and balanced symbol equations; conservation of mass; separating mixtures; the history and structure of the atom; ions; isotopes and relative atomic mass; electronic structure; and the whole periodic table, including Groups 1, 7 and 0.
- Higher Tier H — writing half equations and ionic equations.
- Triple (Chemistry only) T — the transition elements (Section 13).