Ch. 5 Chemistry Crossword

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Across
  1. 2. One of a class of elements having properties intermediate to metals and nonmetals
  2. 3. The number of protons in the nucleus of an atom of an element
  3. 5. A positively charged subatomic particle found in the nucleus of an atom
  4. 7. An arrangement of elements into rows and columns according to similarities n their properties
  5. 11. A subatomic particle with no charge and a mass of 1 amu
  6. 13. Any member of a group of gaseous elements in Group 0 of the periodic table
  7. 14. A unit of mass equal to one-twelfth the mass of a carbon-12 atom
Down
  1. 1. First theory to relate chemical changes to events at the atomic level
  2. 4. The total number of protons and neutrons in the nucleus of an atom
  3. 5. Elements arranged in order of increasing atomic number in a periodic repetition of their physical and chemical properties
  4. 6. Any member of the nonmetallic elements in Group 7A of the periodic table
  5. 8. Atoms of the same element that have the same atomic number but different atomic masses due to different number of neutrons
  6. 9. Stream of electrons produced at the negative electrode of a tube containing gas at low pressure
  7. 10. A negatively charged subatomic particle
  8. 12. The dense central portion of an atom, composed of protons and neutrons