Periodic Table

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Across
  1. 3. a positively charged subatomic particle in the nucleus of an atom
  2. 5. any atoms having the same number of protons but a different number of neutrons
  3. 7. Very Cold
  4. 8. describes how likely an element is to form bonds with other elements
  5. 12. a vertical column (up and down) on the periodic tab
  6. 13. nonmetal
  7. 15. the center of an atom; made up of protons and neutrons
  8. 16. an ion with a positive charge
  9. 18. the process of adding electrons to or removing electrons from an atom or group of
  10. 19. the smallest unit of an element
  11. 20. the elements that are good conductors of heat and electricity
Down
  1. 1. a horizontal row (left to right) in the periodic table.
  2. 2. electrons that are located in the outermost energy level of an
  3. 4. region in an atom where there is a high probability of finding electrons
  4. 6. What We Breath
  5. 9. substance that cannot be broken down into a simpler substance
  6. 10. an atom that has gained or lost one or more electrons.
  7. 11. the number of protons and neutrons in the nucleus of one atom
  8. 14. the number of protons contained in each nucleus of its atoms
  9. 17. an ion with a negative charge
  10. 21. symbol for atomic mass unit