Hunting the Elements from 32:00

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Across
  1. 1. Group _____ has one extra electron in their outer/last shell.
  2. 6. There were about sixty __________ elements that had been identified when Mendeleev made his first table.
  3. 7. Mendeleev left gaps in his table for elements that hadn't been ______________, yet.
  4. 8. The salt that Theo made went into _____________.
  5. 11. More than 70% of the elements on the periodic table are ____________.
  6. 13. The block of elements in the middle (called the transitional elements) are safe to ____________ because they don't react with water or other elements easily.
  7. 14. Some symbols like Gold; Au are based on the element's _______ name.
  8. 15. Most of the things in our world are made up of about __________ elements.
  9. 20. This gas is released when Sodium reacts with Water.
  10. 22. Electrons rule an element's _____________.
  11. 23. The number of electrons that fills the second shell.
  12. 24. The ____________ need just one more electron to be full.
  13. 26. The table gets its shape by arranging the elements by weight, ______________, and reactivity.
  14. 27. 3 elements that filled-in the empty spots on Mendeleev's table were Scandium, Germanium and __________.
  15. 28. Group ______________ wasn't yet discovered so it wasn't included in Mendeleev's table.
Down
  1. 2. The periodic table is arranged by atomic _________.
  2. 3. Electrons are found in _________ around the nucleus.
  3. 4. The atomic weights of elements were compared to _____________, the smallest element.
  4. 5. The _____________ hadn't been discovered yet when Dmitri Mendeleev made his first Periodic Table.
  5. 9. Some elements don't look the way that you may think they would look because since they are so reactive, you generally only find them in their __________ state with other elements into compounds.
  6. 10. These elements are called __________ because they don't like to bond with other elements.
  7. 12. Theo combines Sodium with ___________.
  8. 16. The number of protons in the nucleus of each atom determines it's ______________.
  9. 17. Lithium, Sodium and _____________ explode in water.
  10. 18. Mendeleev made __________ of the elements properties to put into his table.
  11. 19. There is a _____________ line that separates metals from non-metals.
  12. 21. Once Sodium combines with chlorine, they both end up with _________ shells.
  13. 25. Pepto-Bismol is a source of the element ___________.
  14. 28. This is the number of electrons that all elements want in their outer/last shell.