periodic table vocabulary

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Across
  1. 2. a basic unit of a chemical element
  2. 4. the chemical element of atomic number 3, a soft silver-white metal. It is the lightest of the alkali metals.
  3. 8. a structural model of an atom
  4. 10. outermost electron of an atom
  5. 13. a mineral used by the body to help maintain muscles, nerves, and bones
  6. 16. A group of electrons circulating around a nucleus or a molecule
  7. 17. organizes all discovered chemical elements in rows and columns according to increasing atomic number.
  8. 19. a negative charged particle of an atom
  9. 20. chemical elements whose physical and chemical properties fall in between the metal and non-metal categories
Down
  1. 1. the chemical element of atomic number 17, a toxic, irritant, pale green gas.
  2. 3. building block of subatomic particles
  3. 5. A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions.
  4. 6. a subatomic particle found in the nucleus of every atom except that of simple hydrogen
  5. 7. the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.
  6. 9. the chemical element of atomic number 12, a silver-white metal of the alkaline earth series
  7. 11. Russian chemist who developed a periodic table of the chemical elements.
  8. 12. a posotive charged particle of an atom
  9. 14. the structure in a cell that contains the chromosomes
  10. 15. gasses odorless, colorless, monatomic gases with very low chemical reactivity
  11. 18. chemical elements whose physical and chemical properties fall in between the metal and non-metal categories