Key term for OCR GCSE Chemistry A, used in Introducing chemical reactions.
A one- or two-letter internationally agreed code used to represent an element, always written in upright roman text (e.g., Na).
Chemical symbol appears in OCR GCSE Chemistry A revision content for Chemical reactions, especially Introducing chemical reactions and Periodic Table Formulae.
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Elements, compounds and mixtures
Purity and separating mixtures • Deducing Empirical Formulae
