Chemistry Vocabulary

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Across
  1. 3. Electrons in the outermost shell of an atom
  2. 5. The most reactive group of metals on the periodic table
  3. 6. The part of the atom with a positive charge
  4. 7. An atom that has lost or gained one or more electrons
  5. 9. A substance composed of two or more chemical elements
  6. 11. The results of a chemical reaction
  7. 12. The least reactive group on the periodic table
Down
  1. 1. The heaviest part of an atom
  2. 2. Substance used to cause a chemical reaction
  3. 4. The smallest part of an atom
  4. 8. Where the protons and neutrons are found in a atom
  5. 10. the base unit of amount of a substance as determined by the International System of Units
  6. 13. The smallest unit of matter that forms a element