1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
The oxidation number for phosphorus is +3: four covalent bonds with oxygen atoms yield +4 and the central charge yields -1. The oxidation numbers of oxygen and hydrogen are -2â¦ and +1 respectively. The oxidation number of the overall ion is -1.
Phosphine (PH 3) and its organic derivatives (PR 3) are structural analogues with ammonia (NH 3) but the bond angles at phosphorus are closer to 90Â° for phosphine and its organic derivatives. It is an ill-smelling, toxic compound. Phosphorus has an oxidation number of -3 in phosphine.hosphorus(III) oxide, P 4 O 6 (also called tetraphosphorus hexoxide) is the anhydride of P(OH) 3, the minor tautomer of phosphorous acid. The structure of P 4 O 6 is like that of P 4 O 10 less the terminal oxide groups.