The Periodic Table

1234567891011121314151617181920
Across
  1. 2. These have properties of both metals and nonmetals
  2. 6. Group 18 on the periodic table
  3. 8. To find the number of _________; subtract the atomic number from the atomic mass
  4. 10. Electrons in the outer most shell
  5. 15. Group that contains 2 valence electrons and are the second most reactive metals
  6. 17. Abbreviation for Atomic Mass Units.
  7. 18. Atoms that have the same number of protons but different numbers of electrons
  8. 20. What all matter is made of
Down
  1. 1. Group 1 Elements
  2. 3. Group 3-12 elements
  3. 4. These are brittle, poor conductors, and are dull in appearance.
  4. 5. Metals are considered this if they can be made into wire.
  5. 7. These are good conductors of heat and electricity.
  6. 9. metals are considered this if they can be made into sheets
  7. 11. number six on the Periodic Table
  8. 12. The positively charged center of an atom
  9. 13. A __________ is a vertical column on the Periodic Table of Elements
  10. 14. Protons and neutrons are composed of even smaller particles called ______.
  11. 16. The part of an element that takes part in chemical reactions
  12. 19. The horizontal row on the Periodic Table