Crossword Review - Sections 1.1-1.4

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Across
  1. 3. most reactive family of nonmetal elements
  2. 4. scientist who predicted the properties of elements that were still not discovered
  3. 5. unstable isotopes of an atom which decay, giving off radiation
  4. 8. element in group 5, period 4
  5. 9. scientist who discovered the existence of neutrons
  6. 11. scientist who discovered the tiny, dense positive nucleus
  7. 12. type of pure substance composed of only one kind of atom
  8. 14. scientist who stated that the atom is a sphere of positive charges with negative electrons embedded in it
  9. 17. scientist who stated that electrons can move up or down from one orbit to another
  10. 18. scientist whose theory stated that the atom is a small indivisible solid sphere
  11. 19. electrons that occupy the highest, outermost shell of an atom
Down
  1. 1. most elements on the Periodic Table are found in this state at STP
  2. 2. element located near the staircase on the periodic table
  3. 6. named the atom after the Greek word “atomos”
  4. 7. atoms of an element that have a different number of neutrons
  5. 10. this element has 5 valence electrons and 4 shells
  6. 13. scientist who stated the atom is surrounded by a ring of negative electrons
  7. 15. region of an atom in which electrons are most probably located
  8. 16. subatomic particle found in the nucleus of an atom and determines its identity