PERIODIC TABLE

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Across
  1. 3. Number, the number of protons in the atom
  2. 5. Down to the group melting and boiling point increase
  3. 8. How many of periods or rows in periodic table
  4. 9. arrangements of electrons is 2.8.8.7
  5. 10. First chemical element in periodic table
  6. 11. What is symbol of potassium in periodic table
Down
  1. 1. arrangements of electrons is 2.8.8.1
  2. 2. Used as a bleaching agent, component of common table salt
  3. 4. metal, Coloured compounds
  4. 6. Used to fill hot air balloons
  5. 7. gas, The name of group 18