GCSE-Chemistry-Atoms, Elements, Compounds and Mixtures 0.0 / 5 ? ChemistryAtoms and compoundselements and mixturesGCSEAQA Created by: liajean258Created on: 16-12-21 19:03 637251849 Across 1. When a negative ion joins with a positive ion (5, 8) 4. Electrically charged particle, formed when an atom or molecule gains or loses electrons. (3) 5. The smallest part of an element that can exist. (4) 9. Which element has the chemical formula K? (9) Down 2. A substance formed by the chemical union of two or more elements. (8) 3. A collection of two or more atoms held together by chemical bonds. (8) 6. A substance made of one type of atom only. (7) 7. Which element has the chemical formula Na? (6) 8. Two or more substances that are not joined together. The substances can be elements, compounds, or both. (7)
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