Iodine (I) Properties and Facts

Element 53 - Halogen

What are the basic properties of Iodine?

Iodine (symbol: I) is a halogen with atomic number 53. Its atomic mass is 126.9 u, and it belongs to period 5 and group 17.

What is the electron configuration of Iodine?

The electron configuration is: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵

What are the physical properties of Iodine?

Melting point: 386.85 K
Boiling point: 457.4 K
Density: 4.93 g/cm³

What are the known isotopes of Iodine?

  • I-127: 100.0% abundance
  • I-131: Half-life of 8.02 days

What is the biological role and occurrence of Iodine?

Biological role: Essential for thyroid function
Natural occurrence: Found in seawater and certain minerals

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