Contact #4 vocabulary crossword

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Across
  1. 6. Composed mostly of protons and neutrons.
  2. 7. Shiny, ductile, and malleable: combined readily with other element.
  3. 11. Uses the elements symbol and dots to represent outer energy level.
  4. 13. Table where elements are organized by increasing atomic number.
  5. 15. Horizontal rows of elements that contain increasing numbers of protons & eletrons.
Down
  1. 1. The number of protons in an atom, also identifies the element.
  2. 2. Type of matter with fixed composition that can NOT be separated by physical means.
  3. 3. Good conductors of heat & electricity.
  4. 4. Most familiar metals because they often occur in nature uncombined.
  5. 5. Arranged by atomic number and is what we use today.
  6. 8. Substance made up of atoms with the same identity.
  7. 9. Vertical columns of elements with similar properties, numbered 1-18.
  8. 10. Designed the first periodic table based on atomic number.
  9. 12. Most reactive of all metals; Don't occur in nature in their element form.
  10. 14. Atoms of two or more elements combined.