Iodine

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 53
Element Iodine
Symbol I
Atomic Mass 126.904 u
Number of Neutrons 74 (most common isotope, Iodine-127)
Number of Protons 53
Number of Electrons 53
Period 5
Group 17
Phase Solid
Radioactive No
Natural Yes
Metal No
Nonmetal Yes
Metalloid No
Type Halogen
Atomic Radius 115 pm
Electronegativity 2.66 (Pauling scale)
First Ionization Energy 10.451 eV
Density 4.93 g/cm³
Melting Point 113.7 °C
Boiling Point 184.3 °C
Number of Isotopes 1 stable (Iodine-127)
Discoverer Bernard Courtois
Year 1811
Specific Heat 0.214 J/g·K
Number of Shells 5
Number of Valence Electrons 7
Tags: Tutorials Chemistry tutorial step by step learn how to guide examples
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