Periodic Trends Puzzle Project

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Across
  1. 2. This element has a neutral charge and is in row 3.
  2. 4. This element has no valence electrons.
  3. 6. This element has 0 neutrons.
  4. 8. This element has more electronegativity than sodium.
  5. 9. This element has a high ionization energy because its radius is smaller.
  6. 10. This element has 7 valence electrons.
  7. 12. This element has 2 electrons on the first shell, 8 on the second, and 6 on the third.
  8. 13. This element makes up 78.1% of the Earth's atmosphere.
  9. 14. This element has a low electronegativity and is in group 2.
  10. 15. This element has an atomic radius of 227pm.
  11. 18. This element has a charge of +3.
Down
  1. 1. This element is not metallic and is in group 15.
  2. 3. This element has 9 valance electrons.
  3. 5. This element is six times stiffer than steel.
  4. 7. This element is a noble gas, meaning it has a low reactivity.
  5. 11. This element has an atomic mass of 6.941.
  6. 16. This element has 8 protons.
  7. 17. The sun produces 700 million tons every second of this element.