Periodic Table Vocabulary

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Across
  1. 2. abbreviation for atomic mass unit
  2. 5. describes how likely an element is to form bonds with other elements
  3. 6. a vertical column on the periodic table
  4. 10. an atom that has gained or lost one or more electrons
  5. 11. elements that are usually poor conductors of heat and electricity
  6. 14. electrons that are located in the outermost energy level of an atom
  7. 16. the number of protons of an atom or element
  8. 18. ion with a negative charge
  9. 20. the positively charged dense center of an atom
Down
  1. 1. ion with a positive charge
  2. 3. a horizontal row in the periodic table
  3. 4. building block of matter
  4. 7. a stable particle with a positive charge
  5. 8. group 18 elements on the periodic table that contain 8 valence electrons making it stable
  6. 9. the distance between the nucleus of an atom and its outermost energy level
  7. 12. number of protons and neutrons in nucleus of an atom
  8. 13. subatomic particle in the nucleus of an atom with no charge
  9. 15. atoms having the same number of protons but a different number of protons
  10. 17. substance that cannot be decomposed into simpler substances
  11. 19. a region in an atom where there is a high probability of finding electrons