Periodic table

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Across
  1. 2. 7 valence electrons
  2. 4. Atomic number 17
  3. 5. majority of the elements in the periodic table are:
  4. 6. Oxygen belong to
  5. 7. Barium belongs to
Down
  1. 1. valence electrons of calcium
  2. 3. A horizontal row in the periodic table
  3. 4. Most metallic element
  4. 6. A vertical column in the periodic table