Atoms&Molecules

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Across
  1. 3. vertical columns of the periodic table
  2. 5. bases that dissolve in water
  3. 7. Who was the first person to come up with the idea of the atom?
  4. 8. horizontal rows on the periodic table
  5. 9. substances containing only one kind of atom
  6. 10. a term that describes atoms that have the outermost shell filled and are less likely to form compounds
  7. 11. theory the ideas that scientists have about atoms based on repeated observations of how atoms act in experiments
  8. 12. a type of molecule when 2 or more elements are chemically combined
  9. 15. mass the approximate sum of the number of protons and neutrons
  10. 17. the study of matter, what it is made of, what its usual characteristics are, and how it reacts with other matter
Down
  1. 1. a machine designed to smash atoms
  2. 2. solutions with a pH of 7.0; they are neither basic nor acidic
  3. 4. Who developed the “chocolate chip” model of the atom?
  4. 6. the smallest piece of an element that can be recognized as that element
  5. 12. symbols abbreviations for the names of the elements
  6. 13. units that are formed when atoms join with other atoms
  7. 14. an atom that has gained or lost an electron
  8. 15. refers to the number of protons in an atom’s nucleus
  9. 16. J.J. Thomson discovered which atomic particle?