The Periodic Table & Elements

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Across
  1. 2. A one- or two-letter abbreviation for an element.
  2. 4. A metal found in the center of the periodic table.
  3. 7. Atoms of the same element with different numbers of neutrons.
  4. 9. A group of atoms bonded together.
  5. 11. A pure substance made of only one type of atom.
  6. 12. An element that is not shiny and is poor at conducting heat and electricity.
Down
  1. 1. An unreactive element in Group 18 of the periodic table.
  2. 3. An element that is shiny, conductive, and malleable.
  3. 5. The number of protons in an atom's nucleus.
  4. 6. A chart organizing all known elements by their properties.
  5. 8. A highly reactive element in Group 17 of the periodic table.
  6. 10. A substance made of two or more different elements chemically combined.