periodic table

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Across
  1. 2. a table of elements
  2. 7. A pure substance that cannot be broken down.
  3. 8. a number in which you have to find the number of protons and neutrons in thee atom
Down
  1. 1. A property of an element that you can use your senses to observe.
  2. 3. a negatively charged molecue
  3. 4. where you would find thee electrons
  4. 5. a one- or two-letter abbreviation for a chemical element
  5. 6. a number in which you have to find the number of protons in the atom