Caliche brine is oxidized with NO2 or Cl2 to elemental I2, which is stripped with air or adsorbed on ion-exchange resin, then flaked out from the melt.
Research Elements I · atomic number 53 Halogen · period 5, group 17 [Kr] 4d10 5s2 5p5 Shells: 2, 8, 18, 18, 7 Valence electrons: 7 in the outer shell (5s2 5p5) Green dots are the outer shell's s and p electrons. Softer green dots are the d electrons of transition metals, and the d and f electrons of lanthanides and actinides: they often take part in bonding, but not always. Grey dots are the core. Ground-state configuration from the NIST Atomic Spectra Database (A. Kramida, Yu. Ralchenko, J. Reader and the NIST ASD Team). Abundance is the mole fraction of the element found as that isotope on Earth; digits in parentheses are the uncertainty in the last digits. Masses and abundances from NIST, Atomic Weights and Isotopic Compositions (J. S. Coursey, D. J. Schwab, J. J. Tsai and R. A. Dragoset, National Institute of Standards and Technology).Iodine
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 127I 126.9044719(39) 1