CHEMISTRY VOCAB REVIEW

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Across
  1. 3. A stable group of two or more atoms chemically bonded together (these atoms may be identical or different)
  2. 6. This characteristic generally increases as you go from left to right across a period (6,4)
  3. 9. A pure substance that cannot be broken down into simpler substances (e.g., oxygen)
  4. 11. The lightest alkali metal, known for floating on water and reacting with it
  5. 13. A vertical column in the periodic table where elements share similar chemical and physical properties
  6. 15. A substance formed when two or more elements combine chemically
  7. 16. Describes the pH of solutions formed by Group 1 and 2 oxides
  8. 17. Describes a substance that does not react easily with other chemicals
  9. 18. The densest noble gas, found at the bottom of Group 8
  10. 19. A horizontal row in the periodic table where elements show a gradual change in properties
Down
  1. 1. Class of elements that tend to produce acidic oxides eg. carbon dioxide
  2. 2. Mass per unit volume that tends to increase as you move down Group 7
  3. 4. The smallest unit of an element, defined by a nucleus with a specific number of protons
  4. 5. A combination of substances that are physically blended but not chemically bonded
  5. 7. Physical measure that decreases as you move down Group 1 (7,5)
  6. 8. These Group 2 elements form oxides that react with water to create basic solutions—name this group of metals (8,5)
  7. 10. A material made entirely of identical particles that shows one set of properties throughout (4,9)
  8. 12. This property of halogens increases as you move up group 7
  9. 14. A gas in group 18, 8 or 0 of the periodic table known for its low reactivity (5,3)