A00103 is part of the Periodic Picture, a visual representation of the elements in the periodic table. It consists of an orange circle, with a dark purple outline, containing a black atom icon and a number 17 in the centre. The symbol for the element is 'Cl'. This element is Chlorine, a basic element in the human body and other living things, used for many important functions. The atomic number for this element is 17, and its atomic weight is 35.45 g/mol. Chlorine is a key ingredient in many everyday items such as bleach, chlorinated water and swimming pool sanitation.