Lesson 11 and 12

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Across
  1. 2. Elements in the same group generally show _____ size with increasing atomic number.
  2. 4. Good conductors of energy and heat.
  3. 7. Distance between the center of the nucleus of an ion and the outermost electrons.
  4. 8. Scientist who arranged the element according to the increasing atomic mass.
  5. 9. Poor conductors of energy and heat.
  6. 10. Mendeleev’s periodic law stated that the properties of the elements are a periodic function of their:
  7. 11. Ge is a semimetal in group IV A and period:
  8. 12. Property of an element that indicates how strongly an atom of that element attracts electrons in a chemical bond.
  9. 15. Scientis who arranged the elements into triads.
  10. 18. Scientist who arranged the electrons according to the law of Octaves.
  11. 19. Rule that states that atoms tend to gain, lose, or share electrons so that each atom has a full outermost energy level.
Down
  1. 1. Energy required to remove the most loosely held electron from an atom.
  2. 3. The element Si is a semimetal in period 3 that belongs to the group (American system):
  3. 5. Elements in the same period generally show ________ size with increasing atomic number and increasing ionization energy with increasing atomic number.
  4. 6. Scientist that discovered that elements are ordered by atomic number.
  5. 13. The attraction an atom has for its outer electrons.
  6. 14. Property of the element that can be predicted from the arrangement of the periodic table.
  7. 16. Scientist who state the periodic law.
  8. 17. Na is an element in period 3 that belongs to which family?