most likely element and isotope that could be used as fuel to heat gases to be used as spacecraft propellant.?
355914
hydrazine isn't an element but works really well in propulsion :)
574734
Something very close to it already exists:  Ion drive.  This uses charged xenon particles as its propellant.  The acceleration is very low, but it is much more efficient than chemical rockets.  NASA has already put it to practical use with their Deep Space 1 probe, and will use it again with their Helium 3 probe.\n\nOf course, that's still a mass-reaction drive.  A rather exotic one, but still...\n\nOne way of using light for propulsion is with a "solar sail," which The Planetary Society tried to test with its Cosmos-1 mission.  Unfortunately, the probe was lost in a launch failure.  They want to try again, though; you might want to write to them about your idea.
320753
Anything the energy can be converted to use for.\n\nUsually it is light and heat though.
149440
http://www.chemicalelements.com/elements/k.html\n\nhttp://www-spof.gsfc.nasa.gov/stargaze/Q6.htm
697479
Mostly hydrogen. There is a little bit of helium and heavier elements in there as well.
330129
The doesn't really "burn" in the sense of chemically combining hydrogen and oxygen.  It shines because of energy produced by nuclear fusion.\n\nIn physics, nuclear fusion is the process by which multiple nuclei join together to form a heavier nucleus. It is accompanied by the release or absorption of energy depending on the masses of the nuclei involved. Iron and nickel nuclei have the largest binding energies per nucleon of all nuclei and therefore are the most stable. The fusion of two nuclei lighter than iron or nickel generally releases energy while the fusion of nuclei heavier than them absorbs energy; vice-versa for the reverse process, nuclear fission.\n\nNuclear fusion of light elements releases the energy that causes stars to shine and hydrogen bombs to explode. Nuclear fusion of heavy elements (absorbing energy) occurs in the extremely high-energy conditions of supernova explosions. Nuclear fusion in stars and supernovae is the primary process by which new natural elements are created. It is this reaction that is harnessed in fusion power.\n\nIt takes considerable energy to force nuclei to fuse, even those of the least massive element, hydrogen. But the fusion of lighter nuclei, which creates a heavier nucleus and a free neutron, will generally release more energy than it took to force them together — an exothermic process that can produce self-sustaining reactions.\n\nThe energy released in most nuclear reactions is much larger than that for chemical reactions, because the binding energy that holds a nucleus together is far greater than the energy that holds electrons to a nucleus. For example, the ionization energy gained by adding an electron to a hydrogen nucleus is 13.6 electron volts -- less than one-millionth of the 17 MeV released in the D-T (deuterium-tritium) reaction shown to the top right.\n\nThe steps of the main cycle of nuclear fusion in stars were worked out by Hans Bethe.  He won the Nobel prize for this work.
1184856
Hydrogen.  Normally it is a gas at room temperature, and takes extreme cryogenic cold just to make it a liquid, but guess what?\n\nAt a few millionths of a degree above absolute zero, where Helium gas goes liquid, Hydrogen gas actually freezes...and when it does, it arranges itself so that it is physically *metallic*.\n\nAnd yes, this has been tested outside of an earthly laboratory, way outside....\n\nGo to Space.com, do a search on the phrases "core of Jupiter" and "meteor strikes"....a few years ago, a meteor shower hit Jupiter with some fairly large space rocks, and we had radio and satellite telescopes trained on the event....\n\nAnd there was a hypothesis that the core of Jupiter was cold enough and under enough pressure from gravity to be metallic hydrogen...the idea was simple enough, if the core was metallic hydrogen, then when the meteors hit it, it should ring like metal, not just acoustically, but electro-magnetically too, in a predictable way....\n\nAnd.  It.  Did.
237935
francium. mercury is technicaly not a metal, it just has a low melting point, low metling points do not make it unstable. if that were the case, then oxygen would be VERY unstable ITS ALREADY TURNED INTO VAPOR!!!
700039
nitrogen - Liquid nitrogen is used for cooling experiments\noxygen - Always used in breathing and burning fuel. Given in hospitals, used as rocket fuel. \ncarbon dioxide - Used in carbonated drinks, fire extinguishers, and dry ice.\nargon - used as an inert gas to prevent reactions and preserve things.\nhelium - Used in balloons and helium-neon lasers.\nneon - Used in neon signs and helium-neon lasers.\nmethane - Is natural gas, used for heating & generating electricity.
665609
Hydrogen, Oxygen, Nitrogen etc. are some elements\nCarbon tetrachloride, Methane, Ammonia etc are some such compounds.
1043264
The ideal catalyst would\n+Cluster the fuel atoms densely \n+hold the electrons of the atoms to overcome the negative repelling forces between the atoms\n+assist the nuclei of the atoms to join - neutralize the protons repelling each other\n\nA catalyst that can do any one of the above would lower the temperature requirements for fusion. The catalyst probably  would also have to function at a high temperature.\n\nYes - I think that something along these lines could be designed.\n \nYou would  just have to be really careful because after the Pons and Fleischmann cold fusion announcements any cold fusion invention would be under the microscope
455338
From the name I'd say hydrogen, carbon, oxygen and nitrogen
272349
Ca(s) + 2HCl(aq)-->CaCl2 + H2(g)\n\nor...\n\nCalcium Chloride and Hydrogen Gas... you know... the stuff that fuels rockets! :)
802343
The process of fusion: 4H  ----->  1He + 2positrons + neutrinoes\nwhich is:                       4p ------>  1AlphaParticle + 2 positrons\n \nie   4 protons fuse together to give an alpha particle.\n\nIt is very unlikely that 4 protons will be in the same vicinity for this reaction to occur.\n\nIn fusion reactors we use deuterium to fuse into helium.\n                  1D  +  1D    -------->   He\nas we only need two particles to collide. (This is much more likely than 4 protons colliding at once. ) \n\nOn the sun we need a way of storing the hydrogen nuclei until we have gathered 4 of them together and they can then split off as the helium nucleus.  The only store you will find on the sun is the collection of slightly heavier atomic nuclei(known by astronomers as metals and meaning any nucleus heavier than helium).\nThere are a number of pathways thought to be available for this process which proceeds through the weak nuclear reaction at a density of 1 or 2 reactions in each cubic metre of the sun. (see stellar physics books for details).  This process is the equivalent to Catalysis in ordinary chemistry.\n\nThis would be hopeless for the generation of energy in a tokamak    so we could not use this process on earth for the generation of electrical power.
650823
Carbon, Hydrogen, and Oxygen.
386823
There is some 02, N2, CO2. There are also a daub of Argon, hydrogen, neon, helium, and a couple of others I don't remember.\n\nAs a matter of interest, more commercial plants that product liquid nitrogen, oxygen etc, start with liquidfied air and then separate the various components.
802199
Hi,, hydrogen, oxygen, and nitrogen... \n\n good luck.....