Periodic Table Challenge

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Across
  1. 2. It has 2 electron shells and is in Group 2 (Alkaline earth metal).
  2. 4. It has 2 valence electrons and is in Period 4.
  3. 6. This element is very reactive in group 17! It has an atomic mass of 35.45.
  4. 11. This metalloid is a semi conductor. It has 4 electron shells.
  5. 12. It is in Group 1 and Period 3.
  6. 13. This element is a Metalloid and a semi conductor. It has 3 valence electrons.
  7. 15. It has 7 valence electrons and 4 electron shells. Liquid at room temperature.
  8. 16. It has 8 neutrons. It is a non metal and a gas at room temperature.
Down
  1. 1. It has 30 protons and is a transition metal.
  2. 3. This element has one valence electron so it is highly reactive! It has 37 protons.
  3. 5. It has 25 protons and electrons.
  4. 7. This element is a NON metal with only one valence electron! It is a highly reactive gas at room temperature. No neutrons
  5. 8. It is an unreactive noble gas with 8 valence electrons. It is in Period 4.
  6. 9. This element is a metal so it is conductive! It has 65 electrons and an atomic mass of 158.93.
  7. 10. The element has 2 electron shells and an atomic number of 7.
  8. 14. The element is a nonreactive gas and non metal in Group 18. It has 2 electron shells.