physical science unit 2 vocab

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Across
  1. 4. model of an atom that shows electrons in circular orbits around the nucleus
  2. 8. Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alsali-earth metals, shiny, good conductor of thermal energy and electrical current, high density
  3. 12. A subatomic particle that has no charge and that is found in the nucleus of an atom
  4. 14. Elements that are good conductors of electric current and heat
  5. 15. a positively charged atom
  6. 17. Low conductivity, not ductile, not malleable, brittle, dull, gas at room temp
  7. 18. Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
  8. 19. Horizontal rows on the periodic table
  9. 20. one-half the distance between the nuclei of two atoms of the same element when the atoms are joined
Down
  1. 1. The elements in group 8A of the periodic table.Colorless, Odorless, Extremely NONREACTIVE
  2. 2. a charged atom
  3. 3. verticle columns on the periodic table
  4. 5. a negatively charged atom
  5. 6. A subatomic particle that has a negative charge
  6. 7. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
  7. 9. basic unit of matter
  8. 10. Atoms of the same element that have different numbers of neutrons
  9. 11. Elements that have properties of both metals and nonmetals.
  10. 13. A subatomic particle that has a positive charge and that is found in the nucleus of an atom
  11. 16. The ease and speed with which an element combines, or reacts, with other elements and compounds.