periodic table

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Across
  1. 2. - Each row represents one period; the period number of an element indicates how many of its energy levels house electrons
  2. 4. - Metals are located on the left of the periodic table, and nonmetals are located on the upper right they are good conductors of electricity
  3. 7. metal - they are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
  4. 8. gases - exhibit great stability and extremely low reaction rates
  5. 10. metal A nonmetal is an element that is generally a poor conductor of heat and electricity.
  6. 11. - A group of electrons circulating around a nucleus or a molecule
Down
  1. 1. - elements with properties intermediate between metals and nonmetals.
  2. 3. electron - a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.
  3. 5. earth metals - they are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
  4. 6. - They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made.
  5. 9. level - Each row represents an energy level. The elements in each column share similar properties and the same number of valence electrons