Unit 4 - Physcial Science

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Across
  1. 3. Electron Levels/Orbits; Study of light
  2. 9. the mass of an atom expressed in atomic mass units
  3. 10. properties are between those of metals and non metals; semiconductors
  4. 14. a subatomic particle that has no charge and that is located in the nucleus of an atom
  5. 15. in chemistry, a horizontal row of elements in the periodic table; helps us determine the number of shells/ orbits
  6. 17. the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
  7. 18. Electron Clouds
  8. 21. Positive, Dense Nucleus; Gold Foil Experiment
  9. 22. an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
  10. 23. metals Groups 3 - 12
Down
  1. 1. elements with 8 valence electrons
  2. 2. a vertical column of elements in the periodic table; elements in a group share chemical properties; helps us determine the number of valence (outer) electrons; generally help define properties of elements
  3. 4. Elements with 2 valence electrons
  4. 5. one of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); halogens combine with most metals to form salts.
  5. 6. the sum of the numbers of protons and neutrons in the nucleus of an atom
  6. 7. one of the elements of Group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium)
  7. 8. mostly solids; shiny; good thermal conductors; good electrical conductors; malleable
  8. 11. Cathode Ray; Discovery of Electrons; Plum Pudding model
  9. 12. Brittle, Poor conductors, insulators; many are gases at room temperature
  10. 13. a unit of mass that describes the mass of an atom or molecule
  11. 16. Everything is made up of atoms; Each element's atoms were identical to each other; Each element's atoms differ from other element's atoms; Compounds were always the same types of atoms combining
  12. 19. Law the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
  13. 20. a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element