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Which one of the following is NOT a halogen element? 
1. Iodine
2. Selenium
3. Fluorine
4. Astatine

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Correct Answer - Option 2 : Selenium

The correct answer is Selenium.

  • Selenium is NOT a halogen element.

  • The Selenium belongs to the Non-Metal Category.
  • It is found in Group 16(chalcogens) and Period 4 of the Periodic Table with Atomic number 34.
  • It was discovered by Jons Jacobs Berzelius in 1817.
  • Jacobs Berzelius has also discovered Cerium( Atomic Number-58) lying in the Lanthanide Series of f-block elements.
  • Selenium resides in the Solid-phase at STP whereas its Melting point is 494K & its Boiling Point is 958K.

  • Iodine is a group-17 element called halogens.
    • Its atomic number is 53.
    • Its atomic mass is 126.9.
  • Fluorine is also a group-17 element called halogens.
    • Its atomic number is 9.
    • Its atomic weight is 18.
  • Astatine is also a group-17 element called halogens.
    • Its atomic number is 85.
    • Its atomic mass is 210.

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