This fin variety most closely resembles wild betta splendens, as long tails and the subsequent tail types were all selectively bred by human intervention. These fish are often mistaken for female bettas, who generally have shorter fins, but this is an entirely different variety of betta.Males can be distinguished by females by their longer ventral fins, more pointed/angled anal fin, and slightly different body shape.ouble Tail. A fin type in which the caudal (tail) fin is split into two lobes instead of one. This is a genetic trait, and the same genetics that cause this double-tail cause the dorsal and anal fins to be very broad and the body to be shorter, which predisposes these fish to swimbladder problems.
Oxygen = three ions each with a charge of -2 = 3 x -2 = -6. The overall charge of the polyatomic ion is -2. This means that the oxidation number of the carbon must be +4. Total charge = +4 + -6 = -2. Here is a video which discusses this topic by discussing how to determine oxidation numbers of elements in the bicarbonate and dichromate ions. Video from: Noel Pauller.
It is understood that Na has a 1+ oxidation number and O has a 2- oxidation number. Because the total oxidation number of this compound will equal 0, we can set up an equation. We have 2 Na molecules so the total oxidation number is 2+ and we have 3 O molecules so the total oxidation number is 6-. Because we dont know carbon, we set up an equation: 2+x-6=0. x-4=0.