Chemistry Puzzle By Thorat N M

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Across
  1. 2. the elements in the present periodic table are arranged according to their
  2. 5. A horizontal row in the periodic table is called a
  3. 6. What is the capacity of the first electron shell?
Down
  1. 1. A vertical column in the periodic table is called a
  2. 3. How many valence electrons does boron have?
  3. 4. The majority of the elements in the periodic table are:
  4. 5. The atomic number of 16 is