53 I
Halogen
Iodine
Essential for thyroid function.
Properties of Iodine
- Atomic number (Z)
- 53
- Symbol
- I
- Atomic mass
- 126.9 g/mol
- Category
- Halogen
- Group
- 17
- Period
- 5
- Electron configuration
- [Kr] 4d¹⁰ 5s² 5p⁵
- Electronegativity (Pauling)
- 2.66
- Atomic radius
- 115 pm
- First ionization energy
- 1008 kJ/mol
- Melting point
- 386.85 K (113.7 °C)
- Boiling point
- 457.4 K (184.3 °C)
- Density
- 4.93 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1811
Frequently asked questions
What is Iodine?
Iodine (I) is a halogen, element number 53 on the periodic table. Essential for thyroid function.
What is the atomic number and atomic mass of Iodine?
Iodine has atomic number 53 and an atomic mass of about 126.9 g/mol.
What is the electron configuration of Iodine?
The electron configuration of Iodine is [Kr] 4d¹⁰ 5s² 5p⁵.
Where is Iodine on the periodic table?
Iodine sits in group 17, period 5, and is classified as a halogen.