Periodic Table

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Across
  1. 3. A horizontal row of elements that indicates the number of energy shells.
  2. 7. A physical property that describes how shiny or reflective a metal is.
  3. 8. The name for the electrons in the outermost shell that determine reactivity.
  4. 11. Elements that are usually gases or brittle solids and poor conductors.
  5. 12. The one or two letters used to represent an element on the table.
  6. 14. The dense center of an atom containing protons and neutrons.
Down
  1. 1. The ability of a metal to be hammered or rolled into thin sheets.
  2. 2. A material that allows heat or electricity to flow through it easily.
  3. 4. A property of metal that means it can be pulled into a thin wire.
  4. 5. The very reactive non-metals found in Group 17 of the table.
  5. 6. An element found on the "staircase" with properties of both metals and non-metals.
  6. 9. NUMBER, The number of protons in the nucleus of an atom.
  7. 10. The name for the highly reactive metals found in Group 1.
  8. 13. A vertical column of elements that often share similar properties.