Lots and lots of hydrogen.. The sun uses a fusion reaction to combine four hydrogen nuclei to form a helium nucleus. This reaction takes several steps, starting with two hydrogens fusing to form deuterium, which is the isotope of hydrogen that contains one neutron. This is followed by a second collision in which two deuterium nuclei form helium-3, and a final collision produces helium-4. This nuclear reaction powers other stars as well..
Now our wonderful sun converts 600 million tons of hydrogen into helium each second. The helium nucleus has a mass about one-half percent less than the original hydrogen nuclei had. This "missing" mass is converted into the energy that we know and love as sunlight..and warmth..and stuff..
Now that other guy listed several elements for you, and that's all well and good. However..
The sun has never had a fusion reaction that went beyond the stage of helium fusing to carbon. The carbon core becomes extremely dense, but even the high pressure and temperature (about 300 million kelvins) are not enough for carbon nuclei to fuse. When the nuclear fusion does stop for the sun, then the sun will collapse down to a small hot object called a white dwarf star. Good thing the sun has enough hydrogen to last for billions of years at its current rate of consumption..
Now, as for those elements he listed..
In stars more massive than the sun, the greater mass does generate the higher pressure and temperature needed for carbon fusion. In fact, a series of fusion reactions take place in concentric shells within the star, with fusion of carbon, oxygen, neon, and so on until an inner core of iron forms. Now, iron has the most stable nucleus of all of the elements. What this means is that the fusion of iron does not produce energy. Less energy is produced than what you have put in, and so fusion stops at that point. When fusion stops, gravitational collapse takes over, the core becomes unstable, and the star's life ends in a supernova. During the explosion there is a brief period when additional fusion of heavy nuclei takes place. What I mean by that is that all of the elements beyond lithium on your periodic table are the result of these explosions, and are ejected into space from them. The supernova explosion itself is responsible for all of the elements beyond iron in the periodic table.
So now you know that the elements of the sun are hydrogen, helium, and carbon. Well, isotopes of the aforementioned..
No iron because if that were the case, we would all be dead. Our sun is not massive enough to have iron. =) Google it though to check the answers if you really want to be sure of things. This info here is just what I learned in physics. Good luck.
2006-09-18 16:28:20
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answer #1
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answered by La Voce 4
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The greatest of the above-mentioned is hydrogen, followed by helium, with the others lagging far behind.
;-)
2006-09-18 23:02:15
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answer #2
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answered by WikiJo 6
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the sun includes hydrogen, helium, calcium, sodium, magnesium, and iron
2006-09-18 22:57:35
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answer #3
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answered by B-B@!! P!@Y@ 4
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lots and lots of Hydrogen and Oxygen and maybe carbon and some other gases.
2006-09-18 23:01:39
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answer #4
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answered by ~*Prodigious*~ 3
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