The oysters are nucleated with a bead composed of mother-of-pearl and a small piece of mantle tissue. This bead becomes the nucleus of the pearl and is the reason akoya pearls are more often perfectly round.
Carbon definition, Chemistry. a widely distributed element that forms organic compounds in combination with hydrogen, oxygen, etc., and that occurs in a pure state as diamond and graphite, and in an impure state as charcoal.
A carbonâoxygen bond is a covalent bond between carbon and oxygen.ond lengths of C=O bonds are around 123 pm in carbonyl compounds. The C=O bonds in acyl halides have partial triple bond character and are subsequently very short: 117 pm. Compounds with formal CâO triple bonds do not exist except for carbon monoxide, which has a very short, strong bond (112.8 pm).