Periodic Table

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Across
  1. 4. metals that are ductile and malleable
  2. 7. alkali metal with an atomic number of 11
  3. 8. group 17 nonmetals
  4. 9. a metalloid in group 3a
  5. 15. electrons in the highest energy level
  6. 18. a russian chemist
  7. 19. transition metal with 27 electrons
  8. 20. Good conductors of heat and electricity
  9. 21. most reactive metals
  10. 22. Lanthanide with 65 protons
  11. 23. the horizontal rows of the periodic table
Down
  1. 1. all these are radioactive
  2. 2. metal that oxidizes in air
  3. 3. a nonmetal with an average atomic mass of 4.0026
  4. 5. Are brittle and break easily
  5. 6. halogen metal in row 17
  6. 10. a metal with 28 protons
  7. 11. have full valence electrons shells
  8. 12. alkaline earth metal with an average atomic mass of 40.074
  9. 13. noble gas with a symbol of Ne
  10. 14. A.K.A."rare earth metals"
  11. 16. developed a periodic table by increasing atomic mass
  12. 17. Shape can be easy or hard to change