tell me EVERYTHING you know about helium?
827695
Its a very inert, extremely low density element which is low on the periodic table and gaseous at common atmospheric temperature and pressure. And when you breath it in it makes you talk funny. That last one is most important.
733683
Hydrogen is extremely flammable, helium is entirely inert. \n\nGoogle for "Hindenburg".  No one know for sure why it caught fire, but once it did the results were spectacular (in a bad way).  \n\nThe US controlled most of the world supply of helium and wasn't letting Germany have any of it, so they were forced to use hydrogen.\n\nAnd yes, you're right, both of those gases are lighter than air due to their low atomic weight.
540363
Fuse yourself in a big nuclear reaction and try your hardest to morph into a big a ball of plasma as possible. Don't forget, you'll probably have to start off as a large percentage of hydrogen first (with about 23-28% helium in the mix) before you make it.\n\nThe actual formula to your quest would start:\n41H → 4He + 2e+ + 2γ + 2νe (26.7 MeV) \nIn more A list stars, helium is produced in a cycle of reactions catalyzed by carbon, the carbon-nitrogen-oxygen cycle.\n\nIn stars with cores at 108 K and masses between 0.5 and 10 solar masses, helium can be transformed into carbon in the triple-alpha process:\n\n4He + 4He + 92 keV → 8*Be \n4He + 8*Be + 67 keV → 12*C \n12*C → 12C + γ + 7.4 MeV \nFor an overall reaction of:\n\n34He → 12C + γ + 7.2 MeV \n\nHope this helps. Keep at it.
559636
Aargon, Helium. Noble gases are all monoatomic. Gases of Group 8 in the periodic table that is. But as you go down the group, radioactive properties start to develop, like for Radon.
931678
The density of helium is 0.1786 g/L, and the density of air is 1.2 kg/m^3.  With proper unit conversion, the density difference is 0.064lb/ft^3.  Therefore it takes 15.7 ft^3 of helium to lift one pound.
172574
AP Physics is phun, dont let anyone tell you otherwise.\n\nFirst, find the volume of the balloon.\nThe volume of a sphere = 4/3 pi * r^3\nyou are given the radius, so this should be no problem.\n\nOnce you know the volume of the balloon, find how much Helium and air it would take to fill it.\nYou could do this two ways, (the Physics way or the Chemistry way) either by using the molar masses of the gasses....or using the densities of the gasses, the density way is probably easier, but you either need to have those given to you or you can look them up and assume what temperature the experiement is taking place at.\nYou need to find the masses of each of the gasses.\n\nThe lifting force of the balloon will equal the difference in the upward and downward forces acting on it.  The downward force is the force of the Helium's weight, the upward for is the weight of the air that the balloon is displacing (we ignore the weight of the ballooon).\n\nIf you want to believe wikipedia,\nthe density of air at 20 degrees C = 1.204 kg/m^3,\n\none mole of Helium = 4.00 grams.\nAt STP 1 mole of Helium would have a volume of about 22.4 Liters.
979598
No. Combustion occurs b/c something reacts with oxygen. So unless the helium is contaminated with oxygen, no combustion can take place.
530899
Helium has two electrons, so it's first shell is full.
683823
helium \n(He), chemical element, inert gas of Group 0 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at -268.9 C (-452 F). Only under increased pressure (approximately 25 atmospheres) does helium solidify.\nHelium was discovered in the gaseous atmosphere surrounding the Sun by the French astronomer Pierre Janssen, who detected a bright yellow line in the spectrum of the solar chromosphere during an eclipse in 1868; this line was initially assumed to represent the element sodium. That same year, the English astronomer Joseph Norman Lockyer observed a yellow line in the solar spectrum that did not correspond to the known D1 and D2 lines of sodium, and so he named it the D3 line. Lockyer concluded that the D3 line was caused by an element in the Sun that was unknown on Earth; he and the chemist Edward Frankland used the Greek word for sun, helios, in naming the element. The British chemist Sir William Ramsay discovered the existence of helium on Earth in 1895. Ramsay obtained a sample of the uranium-bearing mineral cleveite, and upon investigating the gas produced by heating the sample, he found that a unique bright-yellow line in its spectrum matched that of the D3 line observed in the spectrum of the Sun; the new element of helium was thus conclusively identified. In 1903 Ramsay and Frederick Soddy further determined that helium is a product of the spontaneous disintegration of radioactive substances. \n\nHelium constitutes about 23 percent of the mass of the universe and is thus second in abundance to hydrogen in the cosmos. Helium is concentrated in stars, where it is synthesized from hydrogen by nuclear fusion. Although helium occurs in the Earth's atmosphere only to the extent of 1 part in 200,000 (0.0005 percent), and small amounts occur in radioactive minerals, meteoric iron, and mineral springs, great volumes of helium are found as a component (up to 7.6 percent) in natural gases in the United States (especially in Texas, New Mexico, Kansas, Oklahoma, Arizona, and Utah). Smaller supplies have been discovered in Canada and South Africa and in the Sahara Desert.\n\nAlthough there are six known isotopes of helium, only two are stable: helium-3 (symbolized 3He) and helium-4 (symbolized 4He). The four other isotopes are all radioactive, decaying very rapidly into other substances. The helium that is present on Earth is not a primordial component of the Earth but has been generated by radioactive decay. Alpha particles, ejected from the nuclei of heavier radioactive substances, are nuclei of the isotope helium-4. Helium does not accumulate in large quantities in the atmosphere because Earth's gravity is not sufficient to prevent its gradual escape into space. The trace of the isotope helium-3 on Earth is attributable to the negative beta decay of the rare hydrogen-3 isotope (tritium). Helium-4 is by far the most plentiful of the stable isotopes: helium-4 atoms outnumber those of helium-3 about 700,000:1 in atmospheric helium and about 7,000,000:1 in certain helium-bearing minerals.\n\nHelium-4 is unique in having two liquid forms (see Figure A). The normal liquid form is called helium I and exists at temperatures from its boiling point of 4.21 K (-268.9 C) down to about 2.18 K (-271 C). Below 2.18 K, helium-4 undergoes superfluidity (i.e., its viscosity, or resistance to flow, nearly vanishes) and its thermal conductivity becomes more than 1,000 times greater than that of copper. This liquid form is called helium II to distinguish it from normal liquid helium I. By contrast, the less plentiful helium-3 forms three distinguishable liquid phases (see Figure B), of which two are superfluids. Superfluidity in helium-4 was discovered by the Russian physicist Pyotr Leonidovich Kapitsa in the mid-1930s, and the same phenomenon in helium-3 was first observed by Douglas D. Osheroff, David M. Lee, and Robert C.
67895
This has some info about neon with pics (scroll down on the page)\n\nhttp://ww.chem4kids.com/files/elements/010_shells.html
196284
Take a quick sip of it and that air comes out when you speak.\n\nDon't try to do it a bunch of times in a row though. There's no oxygen in helium so i passed out once trying to do it for too long.
83455
Jupiter is about 90% hydrogen and 10% helium (by numbers of atoms, 75/25% by mass)
747984
NO, All helium produced is done so through seperating it from air where it occurs naturally, but in very small concentrations. Air is seperated through cryogenic distallation. Unless you have some extraordinary equipment in your house, you will not be able to perform this kind of operation.
157799
The term ELEMENT refers to the smallest know particle which can not be broken down into something similar (this term predates alot we have learned about atoms- but thats out of reach of most Earth/Life Science classes).  Things like Helium, Oxygen, Hydrogen, Calcium- in their pure states- are all elements.  All known elemnents are listed on the periodic table which explains what we know of each element's atom.  For example, pure water is H2O The H is Hydrogen, the 2 means in each molecule (or compound-next bigger thing than an element)of water their are 2 hydrogen atoms & the O means there is one oxygen atom.  Oxygen & hydrogen are the elements that make up water, or H2O.  hope that helps :)
505385
Here ya go!\n\nhttp://en.wikipedia.org/wiki/Bose-Einstein_condensate
24312
Depends on temp and pressure, but at room temp, avg. pressure, helium's a gas
652657
Helium floats ,nitrogen will make it drop to the floor..