Science

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Across
  1. 1. substances that are made up of only one kind of particle and have a fixed or constant structure.
  2. 4. table organizes all discovered chemical elements in rows
  3. 5. the basic unit of a chemical element.
  4. 6. columns of the periodic table
Down
  1. 2. the number of protons in the nucleus of an atom, which determines the chemical properties
  2. 3. a part or aspect of something abstract, especially one that is essential or characteristic.
  3. 7. a horizontal row of the periodic table.