
Originally Posted by
gococksDJS
Well, im not sure, but hydrogen is used because it is positively charged and because it's so light, not because it's light weight releases the most energy. See what i'm saying? One mole of hydrogen has a mass of only 1.008 grams while one mole of another cation like sodium has a mass of 22.99 grams. This is good because the ignition of fusion has to take place at very very high temperatures, in the millions of degrees I think, and this has to take place in a very confined space so that the ignition energy isn't lost. E=mc^2 shows that the more mass you have, the more energy you need to increase the temperature, so it would take less energy to heat 50 moles of hydrogen to the fusion temperature than 50 moles of sodium. Once the fusion temperature is reached, two positively charged hydrogen nuclei fuse together and form a helium nucleus. The mass of the helium nucleus that forms is less than the two hydrogen, and the difference is released as energy, and that's thermonuclear energy.