I
Iodine
Z 53 126.904 g/molHalogen
Group
17
Period
5
Block
p
Occurrence
Merging neutron stars 95%Dying low-mass stars 5%Geochemical class: Lithophile
Biological Role
Humans: Micronutrient
History
1811 (discovery, isolation)
Bernard Courtois
Named By
Joseph Louis Gay-Lussac
Latin Name
Iodum
Abundance
Solar System< 0.0001%0.0053 ppm
x
Sun---
x
Meteorites< 0.0001%0.772 ppm
x
Earth's crust< 0.0001%0.7 ppm
x
Oceans< 0.0001%0.06 ppm
x
Humans< 0.0001%0.186 ppm
x