Recovered from flue dust of Pb, Zn or Cu smelting by acid leach, precipitation as Tl2CO3, and electrolysis to metal.
Research Elements Tl · atomic number 81 Post-transition metal · period 6, group 13 [Xe] 4f14 5d10 6s2 6p1 Shells: 2, 8, 18, 32, 18, 3 Valence electrons: 3 in the outer shell (6s2 6p1) 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).Thallium
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 203Tl 202.9723446(14) 0.2952(1) 205Tl 204.9744278(14) 0.7048(1)