Periodic Table Structure

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Across
  1. 4. tell you atomic + mass number and symbol
  2. 6. 20th element on periodic table
  3. 7. tells you the number of protons and electrons equal to number of protons when neutral
  4. 8. element with no neutrons
Down
  1. 1. 4th element down on the 8th column
  2. 2. element with 6 electrons
  3. 3. provides the number of protons
  4. 5. element with 8 protons
  5. 6. 17th element on periodic table