Atoms & Elements CROSSWORD PUZZEL

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Across
  1. 3. number-atoms sum of the numbers of protons and neutrons
  2. 4. particle with one positive charge
  3. 5. solid objects that cannot be divided, created, or destroyed
  4. 7. a particle with negative charge
  5. 10. that atoms contain only one electron
  6. 11. decay-is a process that occurs when an unstable atomic nucleus
  7. 12. rows on the periodic table
  8. 13. Mass-is the average mass of elements isotopes
  9. 15. in a small area in the center of a atom
Down
  1. 1. elements that spontaneously emit radiation
  2. 2. of the same element that haves different numbers of neutrons
  3. 5. atoms
  4. 6. Table-is a chart of the elements arranged into rows and columns according to their physical and chemical properties
  5. 8. electrons & ray tubes
  6. 9. a neutral particle that exists in the nucleus of an atom
  7. 13. smallest piece of an elements that still represents that element
  8. 14. on the left side & the middle of the table