Unit 3 Vocab.

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Across
  1. 2. number the number of protons in the nucleus
  2. 5. smallest particle of an element
  3. 7. table chart that organizes all known elements
  4. 9. element that is a good conductor if heat and electricity
  5. 10. column of elements in the periodic table
  6. 13. a particle in the nucleus with no charge
  7. 14. a particle that carry a negative charge
  8. 15. gas an extremely nonreactive group 18 element
  9. 16. metal element that is characterized by a filled outermost "s" orbital of energy level "n"
  10. 18. an ion that has a negative charge
  11. 19. reactive nonmetallic elements that form strongly acidic compounds with hydrogen
  12. 22. metal group 1 metals, reactive and usually exists as compounds
  13. 24. center of an atom
Down
  1. 1. an atom with the same amount of protons and a different amount of neutrons
  2. 3. ray narrow beam of an electron of an electrical discharge
  3. 4. transition metal elements that have three incomplete outermost electron shells
  4. 6. an ion that has a positive charge
  5. 8. element a element that possesses a wide range of chemical and physical properties
  6. 11. particle in the nucleus with a positive charge
  7. 12. an element that has physical and chemical properties of both metals and nonmetals
  8. 13. element that is generally gases or dull, brittle solids that are poor conductors of heat and electricity
  9. 17. earth metal group 2 elements, highly reactive
  10. 20. of definite proportion a compound is always composed of the same amount of the same elements
  11. 21. number total number of protons and neutrons
  12. 23. a horizontal row of elements in the periodic table