periodic table

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123456789101112131415
Across
  1. 3. the chemical element of atomic number 17, a toxic, irritant, pale green gas.
  2. 6. a precious shiny greyish-white metal, the chemical element of atomic number 47.
  3. 7. a non-metal with semiconducting properties
  4. 8. a precious silvery-white metal, the chemical element of atomic number 78
  5. 10. the chemical element of atomic number 12, a silver-white metal of the alkaline earth series
  6. 11. proton without electric charge.
  7. 14. the chemical element of atomic number 13, a light silvery-grey metal.
  8. 15. the smallest particle of a chemical element that can exist.
Down
  1. 1. the chemical element of atomic number 30
  2. 2. the chemical element of atomic number 33, is a brittle steel-grey metalloid.
  3. 4. the chemical element of atomic number 3, a soft silver-white metal. It is the lightest of the alkali metals.
  4. 5. is a stable subatomic particle
  5. 9. core of an atom
  6. 12. what is the periodic table of.
  7. 13. lightest member of the noble gas series.