Structure of Matter

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Across
  1. 2. The total number of protons plus neutrons in an atom is called the ____ _____.
  2. 4. This class of elements has characteristics in-between metals and nonmetals
  3. 5. This particle has a negative charge
  4. 9. This class of elements are brittle and do not conduct electricity
  5. 10. On a periodic table square, the _____ _____ tells you the number of protons.
  6. 12. Horizontal rows on the periodic table are called___.
  7. 14. This particle doesn't have a charge, it is neutral
  8. 16. This particle has a positive charge
Down
  1. 1. He called the uncuttable bits "atomos"
  2. 3. The Russian scientist who created the first periodic table of elements
  3. 6. The part of the atom that is made of protons and neutrons
  4. 7. This class of elements conduct electricity
  5. 8. Vertical columns on the periodic table are called ____.
  6. 11. The name of the scientist that came up with the atom models we made in class
  7. 13. A pure substance that is made of one type of atom
  8. 15. This is the smallest particle of an element that still has all the characteristics of that element