53
I
Iodine
Iodine
Iodine (I)
Halogens · Solid · Period 5 · Group 17
Element Properties
- Atomic Number
- 53
- Symbol
- I
- Atomic Mass
- 126.9045
- Category
- Halogens
- Standard State
- Solid
- Period
- 5
- Group
- 17
- Electronegativity
- 2.66
- Atomic Radius
- 198
- Ionization Energy
- 10.45
- Electron Affinity
- 3.06
- Oxidation States
- +7, +5, +1, -1
- Melting Point
- 386.85 K (113.7 °C)
- Boiling Point
- 457.55 K (184.4 °C)
- Density
- 4.93
- Electron Configuration
- [Kr]5s2 4d10 5p5
- Year Discovered
- 1811
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Frequently asked questions
What is the atomic number of Iodine?
The atomic number of Iodine is 53, which equals the number of protons in its nucleus.
What is the atomic mass of Iodine?
The atomic mass of Iodine is approximately 126.9045 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Iodine?
The electron configuration of Iodine is [Kr]5s2 4d10 5p5.
Where is Iodine in the periodic table?
Iodine is located in period 5, group 17.
When was Iodine discovered?
Iodine was discovered in 1811.
Related elements
Same group
9
F
Fluorine
18.998
17
Cl
Chlorine
35.45
35
Br
Bromine
79.9
85
At
Astatine
209.987
117
Ts
Tennessine
294.211