Perodic table

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Across
  1. 2. the total number of protons and neutrons in the nucleus of an atom
  2. 6. another name for metalloid
  3. 8. the center of an atom; made up of protons and neutrons
  4. 11. the number of protons in the nucleus of an atom
  5. 13. a quantity equal to one-twelfth the mass of a carbon-12 atom
  6. 15. another name for group
  7. 16. When two nonmetals combine
  8. 17. the elements that are good conductors of heat and electricity
  9. 20. a neutral subatomic particle in the nucleus of an atom
Down
  1. 1. the smallest particle that has the properties of an element
  2. 3. a negatively charged subatomic particle found in the energy level of an atom
  3. 4. a vertical column of elements in the periodic table
  4. 5. group 1 or 1A
  5. 7. a negatively charged subatomic particle found in the energy level of an atom
  6. 9. another name for period
  7. 10. an element that has properties of both a metal and nonmetal
  8. 12. the elements that are usually poor conductors of heat and electricity
  9. 14. When a metal and nonmetal combine
  10. 18. a horizontal row of elements in the periodic table
  11. 19. a positively charged subatomic particle in the nucleus of an atom