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5 Written questions

5 Matching questions

  1. THe matter in the sun and its planets originally came from a gigantic _________
  2. What happens to the heavy elements that a supernove creates?
  3. In 1869 _________ published the first periodic table with ______ elements and three missing elements?
  4. What do we call it when a star explodes?
  5. Who discovered a way to measure the positive charge ( the atomic number) on an atom's nucleus?
  1. a they are blown of into space as the star burns out
  2. b a supernova
  3. c Mendeleev, 63
  4. d supernova
  5. e Henry Moseley in 1913

5 Multiple choice questions

  1. properties
  2. families
  3. a state of matter that is gas-like and is made of free electrons and nuclei of atoms without electrons
  4. similar
  5. (1)atomic number (number of protons), (2) chemical symbol (3) name (4) atomic mass

5 True/False questions

  1. By 1869 how many elements had been discovered?63

          

  2. What are the two differences between Mendeleev's table and the modern periodic table?(1) new elements have been added as they were discovered (2) arranged in order of atomic number , NOT atomic mass

          

  3. How did Mendeleev arrange the elements?in order of increasing atomic mass

          

  4. When these nuclei in the plasma collide they join together and form larger nuclei and release huge amounts of ___________energy

          

  5. From left to right, the properties of elements in a period change in a _________properties

          

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