Periodic Table Vocab Puzzle

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Across
  1. 2. A table that shows the elements
  2. 5. A bond formed when atoms share electrons
  3. 7. The number of protons in an atom
  4. 9. Negatively charged particles
  5. 11. Locations where electrons may be found
  6. 12. A chemical band with one pair of electrons
  7. 15. Dots to represent valence electrons
  8. 17. Electrons on the outermost energy level
  9. 19. A chemical bond with three pairs of electrons
  10. 20. Atoms in the same element that have different numbers of nuetrons
  11. 21. The central part of an atom
Down
  1. 1. When atoms have more protons than electrons
  2. 3. The average mass of all the isotopes
  3. 4. A chemical bond with two pairs of electrons
  4. 6. The smallest part of an element
  5. 8. The smallest particle of a compound
  6. 10. When atoms have more electrons than protons
  7. 11. A pure substance made of only one type of atom
  8. 13. Particles with no charge
  9. 14. A chemical bond due to attraction
  10. 16. A charged atom due to the loss or gain of electrons
  11. 18. Positively charged particles