Period Table Challenge Crossword

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Across
  1. 4. the center of an atom; made up of protons and neutrons
  2. 5. a vertical column of elements in the periodic table
  3. 6. (two words) the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  4. 8. the elemnts that are usually poor conductors of heat and electricity
  5. 9. the smallest particle that has the properties of an element
  6. 10. another name for group
  7. 11. a negatively charged subatomic particle found in the electron cloud of an atom
  8. 12. (three words) a quantity equal to one-twelfth the mass of a carbon-12 atom
  9. 18. a neutral subatomic particle in the nucleus of an atom
  10. 19. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
  11. 20. the elements thta are good conductors of heat and electricity
Down
  1. 1. (two words) an electron in the outermost energy level of an atom
  2. 2. symbol for atomic mass unit
  3. 3. a horizontal row of elements in the periodic table
  4. 7. another name for metalloid
  5. 13. (two words) the total number of protons and neutrons in the nucleus of an atom
  6. 14. an element that has properties of both a metal and nonmetal
  7. 15. another name for period
  8. 16. any atoms having the same number of protons but a different number of neutrons
  9. 17. a positively charged subatomic particle in the nucleus of an atom