Is helium a noble gas?
399354
Yes.The six noble gases are found in group 18 of the periodic table. These elements were considered to be inert gases until the 1960's, because their oxidation number of 0 prevents the noble gases from forming compounds readily. All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable. \n\nHelium \nNeon \nArgon \nKrypton \nXenon \nRadon
762603
When the person speaks, the helium in his lungs go into his mouth and out of his mouth and into the immediate space in front of it.\n\nWhen you hear his voice, it will have gone through a substantial amount of helium before going through air :)
803064
That is the sole reason safety. Hydrogen will explode and helium is a noble gas and is very stable.
809795
Yes, helium will result but so will something else.  Elements are arranged in the periodic table according to their atomic number.  The atomic number is the number of protons in the nucleus.  So, Ra has an atomic number of 88.  So, it loses two protons (neutrons don't count in this calculation) so the new atom's atomic number is 86 (88 minus 2).  Look at a periodic table and the answer will be whatever atom has an atomic number of 86.
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.
979598
No. Combustion occurs b/c something reacts with oxygen. So unless the helium is contaminated with oxygen, no combustion can take place.
742814
They are isotopes. Different isotopes of the same element can exist and these are caused by differing number of neutrons.\n\nThe "common" isotope of Helium is Helium-4 (it has 2 protons and 2 neutrons, hence the 4). \n\nHelium-3 is a variety of Helium (far less common than Helium-4) which has two protons but only one neutron.
193226
All atoms do this. The Noble gasses have the most stable electron configurations because they fill/do not have "open shells".\n\nFor example, Calcium's nearest noble gas is behind it, so it will LOOSE two electrons, since losing two is easier than gaining 6 to act like the next noble gas ahead of it, that's why you see Calcium as a 2+ ion. (Ca2+). Iodine, on the other hand needs to gain one electron (instead of losing 7) to be like it's nearest noble gas, so you get the ion of I-. For a metal like silver, it just has one "valance" electron, so you'll see silver as Ag+. Copper has two extra : Cu2+, Iron typically has 3 valance electrons so it make Fe3+
115529
The method that i know of was to fuse Hydrogen, Deuterium, and Tritium to form a Helium-4 atom.  This is called the "DT" reaction.  I'm not exactly sure about it but i think that using Hydrogen-1 would create an extremely unstable isotope of Helium-2.  When i talked to a physics professor some years back he said the half life of the majority of the helium isotopes was pretty short.
34241
After looking over the literature I have available, I can't come up with one.  None of the noble gases would, and other gases such as nitrogen are nonreactive as well.  That's why they state to run certain reactions in a nitrogen atmosphere.\n\nNoble gases are able to react with some materials, but they often contain halogens, which are highly reactive.  Check out the links to see some compounds of xenon and krypton.
719389
since the all of the valance orbitals are filled, helium is much more stable than hydrogen. therefore, i wont explode or catch on fire or anything dangerous
28066
Nuclear fusion. Deuterium and tritium atoms combine and become helium.
856659
Helium is a lighter gas than the nitrogen/oxygen that our atmosphere is composed of, so a helium balloon will naturally float up.  It pops because the gas inside the balloon expands as the balloon rises to higher altitudes where the air pressure is lower.
757014
Helium IS stable!  In fact, it can be thought of as MORE stable than the other inert gases.  Some of them, like Xe and Kr, form fluorides and in some cases oxides.  But He is so small, and its electrons so close to its nucleus, that it won't give them up, even to fluorine.
742318
Just because Hydrogen is a gas doesn't mean it can't be a metal.\nIt is placed there because as said before it only has 1 outer electron, which is the characteristic trait of all alkali metals.\nIt would not be a noble gas because it is highly reactive, (Remember the Hindenburg explosion?) and noble gasses are highly non-reactive (Xenon, Krypton, and Radon have been known to form compounds with Fluorine though).\nHydrogen does have most properties of the metals though, for example in its liquid form it conducts electricty and heat very well, in its metallic form it shows metallic bonding of its electrons, and it also shows the same charges as metals (e,g; positive charges).\nSo technically Hydrogen is correctly placed in the alkali metals column.
57248
Boron is not a gas.  They are all period II elements, and they all have three orbitals (1s, 2s, 2p).
333613
Commercially, helium isn't made from hydrogen. Helium is found  alonside natural gas in certain natural gas wells. It's actually a fairly limited natural resource.\n\nIt's true that special nuclear reactors can fuse hydrogen nuclei into helium nuclei, and this reaction takes place in the sun as well. However, the amount produced this way on earth is miniscule.