Elements and the Periodic Table

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Across
  1. 3. A combination of substances not chemically joined
  2. 6. A pure substance made of only one type of atom
  3. 8. The smallest particle of an element
  4. 11. An element with properties of both metals and nonmetals
  5. 12. A positively charged particle in the nucleus
  6. 13. How easily an element reacts with other substances
  7. 14. The total number of protons and neutrons
  8. 18. A negatively charged particle that moves around the nucleus
Down
  1. 1. The central part of an atom
  2. 2. One or two letters used to represent an element
  3. 4. A chart that organises all known elements
  4. 5. The number of protons in an atom
  5. 7. A substance made from two or more different elements chemically joined
  6. 9. A neutral particle found in the nucleus
  7. 10. An element that is often dull and a poor conductor
  8. 15. An element that is usually shiny and conducts electricity
  9. 16. A vertical column on the periodic table
  10. 17. A horizontal row on the periodic table