BJU Physical Chapter 4 Vocab

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Across
  1. 4. (no space)have 2 valence electrons; become 2+ cations; slightly less reactive than alkali metals;
  2. 8. (no space)a table of the elements that displays their periodic properties in relationship with their atomic numbers
  3. 9. Came up with element symbols for the first 47 elements
  4. 12. (no space)the electrons in the outermost energy level of a neutral atom
  5. 15. The row on the periodic table
  6. 16. Used X-ray spectroscopy to determine the atomic number for each element
  7. 18. (no space)one or two valence electrons, easily making 1+ or 2+ cations; often found in alloys like sterling silver, steel;
  8. 20. have 4 or more valence electrons; on right of periodic table;
Down
  1. 1. (no space)elements in group 1; one valence electrons; very reactive and form 1+ cations; always found as compounds;
  2. 2. (no space)groups 13-16
  3. 3. group 17; 7 valence electrons so gain 1 to become 1- anions; highly reactive;
  4. 5. Made one of the first lists of 33 elements
  5. 6. almost 80% of elements; few valence electrons; left on periodic table
  6. 7. (no space)two valence electrons forming 2+ cations; first row is rare; second row is radioactive;
  7. 8. (no space)states that the properties of the elements vary in a periodic way with their atomic numbers
  8. 10. between metals and nonmetals; also called semiconductors;
  9. 11. First to organize elements in a table by increasing atomic mass
  10. 13. (no space)8 valence electrons except for helium; unreactive or inert;
  11. 14. Expanded on periodicity, group elements by atomic mass and developed the law of octaves
  12. 17. A set of elements in the same column
  13. 19. Said matter consisted of indivisible particles of elements