Roasting arsenopyrite (FeAsS) in air drives off As2O3 vapor, which is condensed in flue chambers as a white sublimate.
Research Elements As · atomic number 33 Metalloid · period 4, group 15 [Ar] 3d10 4s2 4p3 Shells: 2, 8, 18, 5 Valence electrons: 5 in the outer shell (4s2 4p3) 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).Arsenic
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 75As 74.92159457(95) 1