periodic table

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Across
  1. 2. number the number of protons in the
  2. 6. the area where electrons are found
  3. 7. a table of the chemical elements arrang
Down
  1. 1. a one- or two-letter abbreviatio
  2. 3. characteristics of a substance that can be measured or observed without changing its chemical identity
  3. 4. the total count of proton
  4. 5. the basic component of a whole