OCR A AS Chemistry Atoms and Reactions 4.5 / 5 based on 3 ratings ? ChemistryReactionsASOCR Created by: laurenCreated on: 23-12-12 17:34 7532416 Across 1. The number of particles in the nucleus of an atom (4, 6) 4. A positively or negatively charged atom (3) 6. The number of protons in the nucleus of an atom (6, 6) Down 2. Atoms of the same element with different numbers of neutrons (8) 3. a reagent that oxidises another species (9, 5) 5. The weighted mean mass of an atom of an element compared with one twelfth of the mass of an atom of carbon-12 (8, 6, 4) 7. The mass of an atom of an isotope compared with one twelfth of the mass of an atom of carbon-12 (8, 8, 4)
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