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Therefore, it is located in group 1. Calcium (Ca) is in group 2, for it contains two valence electrons. In the old IUPAC system the letters A and B were designated to the left (A) and right (B) part of the table, while in the CAS system the letters A and B are designated to main group elements (A) and transition elements (B).
59 Co is the only stable cobalt isotope and the only isotope that exists naturally on Earth. Twenty-two radioisotopes have been characterized: the most stable, 60 Co, has a half-life of 5.2714 years; 57 Co has a half-life of 271.8 days; 56 Co has a half-life of 77.27 days; and 58 Co has a half-life of 70.86 days.
co-, an English prefix meaning coming together; Cardiac output (CO), the volume of blood being pumped by the heart per time unit; Castres Olympique, a French rugby club; Certificate of occupancy (CO), a legal document; Certificate of origin (often abbreviated to C/O or CoO), in international trade; Company, abbreviated co.
Over time, companies have evolved to have the following features: "separate legal personality, limited liability, transferable shares, investor ownership, and a managerial hierarchy". [1] The company, as an entity, was created by the state which granted the privilege of incorporation. [1] Companies take various forms, such as:
Co 1 is one of the 26 sporadic groups and was discovered by John Horton Conway in 1968. It is the largest of the three sporadic Conway groups and can be obtained as the quotient of Co 0 (group of automorphisms of the Leech lattice Λ that fix the origin) by its center, which consists of the scalar matrices ±1.
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In organic chemistry, a carbonyl group is a functional group with the formula C=O, composed of a carbon atom double-bonded to an oxygen atom, and it is divalent at the C atom. It is common to several classes of organic compounds (such as aldehydes , ketones and carboxylic acid ), as part of many larger functional groups.