Crossword Review - Sections 1.1-1.4

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