Formula unit Formula unit A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound. Examples include ionic NaCl and KO and covalent networks such as SiO and C (as diamond or graphite). Ionic compounds do not exist as individual molecules; a formula unit thus indicates the lowest reduced ratio of ions in the compound. A "chemical formula" shows the kinds and numbers of atoms in the smallest representative unit of a substance. In
Organocadmium compound to be carcinogen to humans by the IARC. Organocadmium compound An organocadmium compound is an organometallic compound containing a carbon to cadmium chemical bond. Organocadmium chemistry describes physical properties, synthesis, reactions and use of these compounds. Cadmium shares group 12 with zinc and mercury and their corresponding chemistries have much in common. Dimethylcadmium consists of linear molecules with C-Cd bond lengths of 213 pm. All organocadmium compounds are sensitive to air, light and moisture. The first organocadmium compounds, dimethylcadmium, CH-Cd-CH, and diethylcadmium, CHCH-Cd-CHCH, were prepared in 1917 by Erich Krause. In general, they are prepared by transmetalation or by an