periodic table vocab

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Across
  1. 2. symbol for atomic mass unit
  2. 3. a region in an atom where there is a high probability of finding electrons
  3. 4. law the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  4. 6. an ion with a negative charge
  5. 8. a neutral subatomic particle in the nucleus of an atom
  6. 11. mass unit a quantity equal to one-twelfth the mass of a carbon-12 atom
  7. 14. any atoms having the same number of protons but a different number of neutrons
  8. 15. a negatively charged subatomic particle found in the energy level of an atom
  9. 16. an ion with a positive charge
  10. 18. the smallest particle that has the properties of an element
Down
  1. 1. electron an electron in the outermost energy level of an atom
  2. 4. a horizontal row of elements in the periodic table
  3. 5. the process of adding electrons to or removing electrons from an atom or group of atoms
  4. 7. the center of atom made up of protons and neutrons
  5. 9. level any of the possible energies an electron may have in an atom
  6. 10. a vertical column of elements in the periodic table
  7. 11. number the number of protons in the nucleus of an atom
  8. 12. number the total number of protons and neutrons in the nucleus of an atom
  9. 13. a positively charged subatomic particle in the nucleus of an atom
  10. 17. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge