The Periodic Table

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Across
  1. 3. An electron that is in the highest occupied energy level of an atom.
  2. 8. a value that depends on the distribution of an element’s isotopes.
  3. 9. Arrangement of elements in columns and rows.
  4. 10. Elements that are good conductors of electric current and heat .
Down
  1. 1. The elements in Group 8A of the periodic table.
  2. 2. A row in a periodic table of elements.
  3. 4. Elements that are poor conductors of heat and electrical current
  4. 5. The elements in group 1a of the periodic table, not including hydrogen.
  5. 6. Each column on the periodic table is called a _
  6. 7. Elements with properties that fall between those of metals and non metals.