Periodic Table

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Across
  1. 5. group 2 elements not as reactive as group 1
  2. 7. horizontal rows on the periodic table
  3. 8. A subatomic particle that is neutral and that is found in the nucleus
  4. 9. brittle , dull, poor conductors of heat and electricity
Down
  1. 1. Group 1 elements (except Hydrogen) - most reactive on the periodic table
  2. 2. vertical columns on the periodic table or called families
  3. 3. Positively charged particle in the nucleus of an atom
  4. 4. pure substance that consists entirely of one type of atom
  5. 6. negatively charged particle that moves around the nucleus
  6. 10. he smallest unit of an element