APT Crossword Puzzle

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Across
  1. 5. The smallest particle of an element
  2. 9. Abbreviation of the name of an element
  3. 10. The number of protons and neutrons
  4. 11. A bond when atoms share one or more pairs of electrons
  5. 13. Vertical column of elements in the periodic table
  6. 14. Attraction between oppositely charged atoms
  7. 15. An element that is shiny (Silver) and that conducts electricity well
  8. 16. Charged particle that gains or loses electrons
  9. 19. Group of atoms held together by chemical bonds
  10. 20. Electrons in the outermost level of an atom
  11. 21. Particle that has no charge
Down
  1. 1. A bond formed by the attraction btw (+) metal ions and electrons
  2. 2. Particle that has a positive charge
  3. 3. An element that conducts heat and electricity poorly
  4. 4. Average mass of isotopes
  5. 6. The table of elements
  6. 7. The number of protons in the nucleus of atoms
  7. 8. Region around nucleus filled with electrons
  8. 9. An interaction that holds atoms or ions together
  9. 12. Substance made up of one or more of the same kind of atom chemically combined
  10. 17. Horizontal row of elements (from left to right) on the periodic table
  11. 18. Particle that has a negative charge
  12. 21. Center of an atom filled with protons and neutrons