Periodic Table Crossword

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Across
  1. 3. Elements that are dull, brittle, and often a gas at room temperature.
  2. 7. Atomic number is the number of _________________ an atom has.
  3. 9. ______________ gases are also called nonmetals.
  4. 11. Group 17 on the Periodic Table.
  5. 13. Positively charged ion.
  6. 14. Bond between nonmetals.
  7. 17. Atoms of the same elment that have a different number of neutrons.
  8. 18. An electron _________ model has the element symbol and valence electrons.
Down
  1. 1. Rows (across) on the Periodic Table.
  2. 2. Columbs (up/down) on the Periodic Table.
  3. 3. Atomic mass is the number of protons plus the number of ________________.
  4. 4. Elements that are shiny and good conductors.
  5. 5. Negatively charged ion.
  6. 6. A ____________ model has the number of electrons and rings.
  7. 8. The positively charged center of the atom.
  8. 10. Particles with a -1 charge that occupies the space around the nucleus.
  9. 12. Smallest particle of an element that retains the elements properties.
  10. 15. An electron _____________ model is the most accurate model.
  11. 16. Metals are found on the ___________ side of the stair step on the Periodic Table.
  12. 17. An atom with charge.