Periodic Table

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Across
  1. 1. symbol for atomic mass unit
  2. 3. period
  3. 4. an ion with a positive charge
  4. 5. an atom or a group of atoms that has lost or gained one or more electrons and has a net electric charge
  5. 9. any of the possible energies an electron may have in an atom
  6. 14. the elements that are usually poor conductors of heat and electricity
  7. 15. the process of adding electrons to or removing electrons from an atom or group of atoms
  8. 16. the center of an atom that is made up of protons and neutrons
  9. 17. an element that has properties of both a metal and nonmetal
Down
  1. 1. an ion with a negative charge
  2. 2. metalloid
  3. 5. any atoms having the same number of protons but a different number of neutrons
  4. 6. a neutral subatomic particle in the nucleus of an atom
  5. 7. a horizontal row of elements in the periodic table
  6. 8. a region in an atom where there is a high chance of finding electrons
  7. 10. a vertical column of elements in the periodic table
  8. 11. a negatively charged subatomic particle found in the energy level of an atom
  9. 12. a positively charged subatomic particle in the nucleus of an atom
  10. 13. group
  11. 17. the elements that are good conductors of heat and electricity
  12. 18. the smallest particle that has the properties of an element