Periodic Table of Elements Crossword

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Across
  1. 4. a positively charged subatomic particle in the nucleus of an atom
  2. 7. a negatively charged subatomic particle found in the energy level of an atom 
  3. 8. an element that has properties of both a metal and nonmetal
  4. 11. (Two Words No Space) the total number of protons and neutrons in the nucleus of an atom
  5. 12. (Two words No Space) the number of protons in the nucleus of an atom
  6. 14. (Two Words No Space) an electron in the outermost energy level of an atom
  7. 17. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
  8. 18. the center of an atom; made up of protons and neutrons
  9. 19. the elements that are good conductors of heat and electricity
Down
  1. 1. any atoms having the same number of protons but a different number of neutrons
  2. 2. a vertical column of elements in the periodic table
  3. 3. an ion with a negative charge
  4. 5. the smallest particle that has the properties of an element
  5. 6. (Two Words No Space) any of the possible energies an electron may have in an atom
  6. 9. (Three Words No Space)a quantity equal to one-twelfth the mass of a carbon-12 atom
  7. 10. symbol for atomic mass unit
  8. 13. (Two Words No Space) the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  9. 15. a neutral subatomic particle in the nucleus of an atom
  10. 16. a region in an atom where there is a high probability of finding electrons