53 I 126.904
Iodine
diatomic nonmetal
Properties
- Atomic number
- 53
- Atomic mass
- 126.904 u
- Category
- diatomic nonmetal
- Group
- 17
- Period
- 5
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 7
- Electronegativity
- 2.66 (Pauling)
- Density
- 4.933 g/cm³
- Melting point
- 113.7 °C
- Boiling point
- 184.25 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
Noble-gas shorthand: [Kr] 4d¹⁰ 5s² 5p⁵
Electrons per shell: 2, 8, 18, 18, 7, which is 7 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Iodine
Iodine is a chemical element with symbol I and atomic number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due to the color of iodine vapor. Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers.
- Discovered by Bernard Courtois
- Appearance: lustrous metallic gray, violet as a gas
Iodine: frequently asked questions
- What is Iodine?
- Iodine (I) is the chemical element with atomic number 53. It is a nonmetal (diatomic nonmetal).
- What is the atomic number of Iodine?
- Iodine's atomic number is 53, which means every Iodine atom has 53 protons in its nucleus.
- What is the electron configuration of Iodine?
- The electron configuration of Iodine is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5 (noble-gas shorthand: [Kr] 4d10 5s2 5p5). Its electrons are arranged in shells of 2, 8, 18, 18, 7, with 7 in the outermost shell.
- Is Iodine a metal or a nonmetal?
- Iodine is a nonmetal (diatomic nonmetal).
- What group and period is Iodine in?
- Iodine is in group 17 and period 5 of the periodic table.
- Is Iodine a solid, liquid, or gas?
- At room temperature, Iodine is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.