Unit 6b

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Across
  1. 3. a chemical reaction that requires an input of energy usually feels cold when it absorbs the heat in the reaction
  2. 4. electrons on the outermost energy level of an atom that determines its reactivity
  3. 5. vertical on the periodic table that have similar physical and chemical properties
  4. 7. an interaction that holds an atom together
  5. 8. elements that have metal and nonmetal properties are found in a zig zag in the pattern
Down
  1. 1. a chemical reaction in which heat is released and usually feels warm when the heat is released
  2. 2. states that matter is neither created nor destroyed in ordinary physical and chemical changes
  3. 6. horizontal on the periodic table that have the same number of electron shells