Valence Electrons Puzzle #1

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Across
  1. 2. What is helium's reactivity?
  2. 4. Which element has 3 energy levels and 1 valence electron?
  3. 7. A vertical column (up and down) on the periodic table.
  4. 10. Which element has 18 protons and 20 neutrons?
  5. 11. The smallest unit of an element that has all of the properties of the element; the basic building block of matter.
  6. 13. The space where electrons are located.
  7. 14. Describes how likely an element is to form bonds with other elements.
  8. 15. A horizontal row (left to right) in the periodic table.
  9. 17. Which group is not reactive because they have eight valence electrons?
  10. 18. Which Alkali metal has 4 energy levels?
  11. 22. What is magnesium's reactivity?
  12. 24. The number of protons and neutrons in the nucleus of one atom of the element.
  13. 25. Which element has a full outer level with only 2 electrons?
Down
  1. 1. A chart that organizes information about all of the known elements according to their atomic number.
  2. 3. Which element has 27 protons?
  3. 5. What is lead's reactivity?
  4. 6. Elements like to have 8 valence electrons. This is called an ... rule.
  5. 8. The element with 92 protons is called...
  6. 9. Another word for a non-reactive element.
  7. 12. Hg is the chemical symbol for...
  8. 16. Another name for "energy level."
  9. 19. Which element has 2 valence electrons and 3 energy levels?
  10. 20. Fluorine has 10 neutrons and so does...
  11. 21. Which element has 8 valence electrons and 2 energy levels?
  12. 23. Protons and neutrons are located here.