periodic table of elements

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Across
  1. 2. a positively charged subatomic particle in the nucleus of an atom
  2. 3. a vertical column of elements in the periodic table
  3. 5. atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
  4. 7. subatomic particle in the nucleus of an atom
  5. 8. an ion with a positive charge
  6. 9. number the number of protons in the nucleus of an atom
  7. 11. a negatively charged subatomic particle found in the energy level of an atom
  8. 12. the total number of protons and neutrons in the nucleus of an atom
  9. 13. law the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
Down
  1. 1. an ion with a negative charge
  2. 4. period a horizontal row of elements in the periodic table
  3. 6. region in an atom where there is a high probability of finding electrons
  4. 7. the center of the atom
  5. 9. the smallest particle that has the properties of an element
  6. 10. any atoms having the same number of protons but a different number of neutrons