Apt Unit review crossword

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Across
  1. 1. Central core of an atom
  2. 5. What fills in periodic table
  3. 7. The electrons displayed around the nucleus
  4. 9. Weighted average of mass of all neutral isotopes
  5. 11. Rows in periodic table
  6. 14. # of protons
  7. 16. Right side of the periodic table
  8. 19. stable subatomic particle that has a positive charge
  9. 20. a stable subatomic particle with a charge of negative electricity
  10. 22. Model to represent an element
Down
  1. 2. Bond of elements
  2. 3. Chemical bond formed between two ions with opposite charges
  3. 4. Staircase/barrier on the periodic table of metals and nonmetals
  4. 5. system that surrounds the nucleus
  5. 6. # of protons and neutrons
  6. 8. sharing of an electron pair between two atoms
  7. 10. Smallest particle of an element
  8. 12. Charged particle (cations=+) (anions=-)
  9. 13. Columns in periodic table
  10. 15. Atoms of the same element with a different # of neutrons
  11. 17. a subatomic particle of about the same mass as a proton but without an electric charge
  12. 18. Left side of the periodic table
  13. 21. Smallest particle of a substance, composed of one or more atoms