Periodic Table I 0.0 / 5 ? ChemistryElements and compounds Years 7-9 (KS3)None Created by: bish50Created on: 15-04-22 10:26 32514 Across 1. Simplest building blocks of all matter. (4) 4. Colourless gas makes up 21% of the atmosphere. (6) Down 2. When two or more elements join in a chemical reaction. (8) 3. Metal number 20 (7) 5. Matter that is made from one type of atom. (7)
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