Chlor-alkali electrolysis of NaCl brine in a membrane cell: Cl2 at the anode, H2 and NaOH at the cathode; the membrane keeps the products apart.
Research Elements Cl · atomic number 17 Halogen · period 3, group 17 [Ne] 3s2 3p5 Shells: 2, 8, 7 Valence electrons: 7 in the outer shell (3s2 3p5) 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).Chlorine
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 35Cl 34.968852682(37) 0.7576(10) 37Cl 36.965902602(55) 0.2424(10)