From copper-refinery anode slime: roasted with soda ash to sodium tellurite, dissolved, acidified, and reduced with SO2 to Te powder.
Research Elements Te · atomic number 52 Metalloid · period 5, group 16 [Kr] 4d10 5s2 5p4 Shells: 2, 8, 18, 18, 6 Valence electrons: 6 in the outer shell (5s2 5p4) 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).Tellurium
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 120Te 119.9040593(33) 0.0009(1) 122Te 121.9030435(16) 0.0255(12) 123Te 122.9042698(16) 0.0089(3) 124Te 123.9028171(16) 0.0474(14) 125Te 124.9044299(16) 0.0707(15) 126Te 125.9033109(16) 0.1884(25) 128Te 127.90446128(93) 0.3174(8) 130Te 129.906222748(12) 0.3408(62)