The Periodic Table

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Across
  1. 4. A group of atoms bonded together
  2. 9. electron _______ - The arrangement of electrons in shells around an atom's nucleus
  3. 12. An electron in the outermost occupied shell of an atom
  4. 15. A dull, brittle element that does not conduct heat or electricity
  5. 16. A substance made up of two or more types of atom bonded together
  6. 17. an element that has properties that are intermediate between those of metals and nonmetals
Down
  1. 1. electron _____ - A grouping of electrons around the nucleus of an atom
  2. 2. An atom or molecule with a net charge
  3. 3. a row in the periodic table
  4. 5. A shiny, malleable element that conducts heat and electricity
  5. 6. A metalloid with an electron configuration 2,8,4
  6. 7. A column in the periodic table
  7. 8. ______ gas - A group of elements that are non-reactive due to full valence shell
  8. 10. An element with an atomic number of 12
  9. 11. An element in group 18, period 2
  10. 13. A particle with no net charge
  11. 14. An element with 9 protons