Iodine (I) — Halogen. Atomic number 53.
Blue-black crystalline solid
- Atomic number: 53
- Symbol: I
- Atomic mass: 126.90 u
- Category: Halogen
- State: Solid
- Melting point: 113.75 °C / 386.9 K
- Boiling point: 184.25 °C / 457.4 K
- Density: 4.93 g/cm³ (20°C)
- Electron configuration: [Kr] 4d10 5s2 5p5
- Oxidation states: −1, +1, +3, +5, +7
- Electronegativity: 2.66
- Discovered by: Bernard Courtois (1811)
Common uses: Medicine, Antiseptics, Nutrition supplements
Biological role: Essential for thyroid hormone production.
Frequently Asked Questions about Iodine
What is the atomic number of iodine?
Iodine has an atomic number of 53, meaning each atom contains 53 protons in its nucleus.
What is the atomic mass of iodine?
The standard atomic weight of iodine is 126.90 u (unified atomic mass units).
What category does iodine belong to?
Iodine is classified as a halogen.
What is the state of iodine at room temperature?
Iodine is a solid at 20 °C (68 °F).
What is the melting point of iodine?
The melting point of iodine is 113.75 °C / 386.9 K.
What is the boiling point of iodine?
The boiling point of iodine is 184.25 °C / 457.4 K.
What is the density of iodine?
The density of iodine is 4.93 g/cm³ (20°C).
What is the electronegativity of iodine?
Iodine has a Pauling electronegativity of 2.66.
What is the electron configuration of iodine?
The electron configuration of iodine is [Kr] 4d10 5s2 5p5.
What are the common oxidation states of iodine?
Iodine commonly exhibits the following oxidation states: −1, +1, +3, +5, +7.
When was iodine discovered?
Iodine was discovered in 1811 by Bernard Courtois.
Is iodine radioactive?
Iodine is a stable element with no naturally occurring radioactive isotopes.
What is the biological role of iodine?
Essential for thyroid hormone production.
What are the common uses of iodine?
Iodine is used for: Medicine; Antiseptics; Nutrition supplements.
