Get to know the Periodic Table

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Across
  1. 3. something every humans use
  2. 5. any of various metallic elements
  3. 10. the number of protons in the nucleus of an atom
  4. 12. a substance that is in a gaseous, or vaporous, state of matter
  5. 14. is the first element on the periodic table
  6. 17. any of the strongly basic metals
  7. 19. an unstable form of elements in an atomic nucleus with an excess nuclear charge
  8. 20. a chart of chemical elements organized by atomic number
  9. 22. any of a group of rare gases
Down
  1. 1. a one or two letter symbol that represents the element
  2. 2. elements with atomic numbers 58-71
  3. 4. is a substance where the particles are still close together, but not as tightly bonded
  4. 6. shiny metals with low melting points
  5. 7. there are families which are groups of elements with similar properties.
  6. 8. The main elements of nature for life on earth
  7. 9. poor conductors of heat and electricity
  8. 11. they touch the bold step-shaped line in periodic table
  9. 13. the number assigned to the vertical columns of the periodic table
  10. 15. constructed into elements by humans
  11. 16. is the sixth period and third group of the periodic table
  12. 18. a state of matter that is in a firm
  13. 21. is a substance that is in a gaseous, or vaporous, state of matter