Iodine Atomic Mass

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IsotopeAtomic mass (Da)Isotopic abundance (amount fraction)
127I 126.904 47(3)1

Iodine is a monoisotopic element and its atomic weight is determined solely by its isotope 127I. The Commission last revised the standard atomic weight of iodine in 1985 based on the latest Atomic Mass Evaluation by IUPAP.

Atomic Mass # of Atoms: Mass Percent: Sodium: Na: 22.989770: 1: 15.337%: Iodine: I: 126.90447: 1: 84.663% ››. Atomic Number 53 Atomic Mass 126.904473 Density 4.93 g/mL. State solid Color violet-dark grey Electronegativity 2.66. Natural Isotope I-127 100%. Abbreviated Electron Configuration Kr 4d 10 5s 2 5p 5. Discovered by Bernard Courtois in 1811.

129I has been measured in terrestrial samples that have been exposed to cosmic radiation, and in materials that contain fallout fromnuclear explosions. These measurements can be used for geochronological and environmental studies,but they also confirm the low abundance of 129I in nature, and its insignificance with respect to theatomic weight of iodine.

MassSOURCEAtomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003Mass

CIAAW

Mass

Iodine Atomic Mass Number

Iodine neutrons

Iodine Atomic Mass In Grams

Iodine
Ar(I) = 126.904 47(3) since 1985
The name derives from the Greek iodes for 'violet' because of its violet vapours. Iodine was discovered inseaweed by the French chemist Bernard Courtois in 1811, and named by the French chemist Louis-Joseph Gay-Lussac, when he proved it was an element in 1814.