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Across
  1. 3. A vertical column in the periodic table that contains elements with similar properties.
  2. 4. A substance that is made up of only one type of atom.
  3. 5. A chart that organizes elements based on their atomic number and chemical properties.
  4. 7. Elements that have properties of both metals and nonmetals.
  5. 9. A horizontal row in the periodic table that indicates the number of electron shells an atom has.
  6. 10. A one or two-letter abbreviation used to represent an element.
Down
  1. 1. Electrons in the outermost energy level of an atom that are involved in bonding with other atoms.
  2. 2. Elements that are generally poor conductors of heat and electricity.
  3. 6. The number of protons found in the nucleus of an atom, which determines the element's identity.
  4. 8. Elements that are typically shiny, malleable, and good conductors of heat and electricity.