Atoms and Elements

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Across
  1. 2. A substance with only one kind of atom
  2. 4. found at the center of every atom
  3. 8. a subatomic particle with a positive electrical charge
  4. 9. The number of protons in an atom
  5. 10. these elements conduct heat and electricity well
Down
  1. 1. a table of elements arranged by atomic number
  2. 3. A subatomic particle with no electrical charge
  3. 5. these elements don't conduct heat or electricity
  4. 6. the smallest unit of an element
  5. 7. a substance made of two or more elements
  6. 11. a subatomic particle with a negative electrical charge