Unit 4 vocabulary

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Across
  1. 2. Vertical column in the periodic table
  2. 3. A combination of chemical symbols and numbers to represent a substance
  3. 8. the number of electrons in the outermost energy level
  4. 13. A table that classifies elements by their physical and chemical properties; rows are called periods; columns are called groups
  5. 14. horizontal line on the periodic table
  6. 15. A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions
  7. 16. molecules that contains more than one element
Down
  1. 1. elements that are usually dull in appearance, poor conductors of heat and electricity, gases at room temperature
  2. 4. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
  3. 5. makes up most of the periodic table
  4. 6. elements with properties that fall between those of metals and nonmetals
  5. 7. groups of two or more elements bound by chemicals
  6. 9. Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
  7. 10. have a full outer s and p sub-shells of 8 electrons and, therefore, are stable and tend not to form ions
  8. 11. A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound
  9. 12. Group 17 Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive