[DOC] [TLE] Lighter than air - Wikipedia [PAR] Although helium is twice as heavy as (diatomic) hydrogen, they are both so much 
lighter than air that this difference only results in hydrogen ... of the dirigible and 
hence increasing its range significantly. [DOC] [TLE] Helium - Wikipedia [PAR] Helium is a chemical element with symbol He and atomic number 2. It is a 
colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the 
noble gas group in the periodic table. Its boiling point is the lowest among all the 
elements. ..... All elements other than hydrogen and helium today account for only 
2% of the... [DOC] [TLE] Elements and Atoms - Kimball's Biology Pages [PAR] For example, hydrogen, carbon, and nitrogen together represent less than 1% of 
... Neutrons have the same weight as protons but no electrical charge. The 
helium atom has two electrons so that, once again, the atom as a whole is neutral
. ... Each element has a unique atomic number and its atoms have one more 
proton... [DOC] [TLE] The Origin of The Elements [PAR] Sep 10, 2004 ... Massive stars can synthesize elements heavier than oxygen (O); ... are the only 
place in our universe where the elements heavier than ... As stellar time goes, the 
helium won't last longcertainly less than a mere few hundred million years. 
With its helium transformed into unburnable carbon, the solar core... [DOC] [TLE] Lifting Power of Helium and Hydrogen and Rigid Airship Operations [PAR] Hydrogen is the earth's lightest element and can be manufactured easily and ... 
Helium's non-flammable nature makes it the only practical lifting gas for ... 
Although helium weighs twice as much hydrogen, because each gas is so ... 
range (because it can carry less fuel), than a hydrogen-inflated airship of the 
same size. [DOC] [TLE] hydrogen - Why do we use helium in balloons? - Chemistry Stack ... [PAR] Sep 8, 2014 ... Thus, helium is only about 7.5% less buoyant in air than hydrogen. ... balloon (at 
ambient temperature) would not lift much weight. ... but alas, it's both less buoyant 
and more expensive than helium. .... Helium (or any other group 18 element) will 
not oxidize (burn) by any process you'll find on this planet. [DOC] [TLE] General Chemistry/Chemistries of Various Elements/Hydrogen ... [PAR] It is also the lightest of gases, weighing less even than helium. ... Hydrogen 
readily shares its electron with a strongly electronegative element, like any .... can 
bond with only one other element, and then only in a single bond, hydrogen 
allows... [DOC] [TLE] Helium Facts - Atom, Properties, Uses, Gas, Balloons, Voice ... [PAR] Helium is a chemical element with the symbol He and atomic number 2. ... 
element in the Universe (after hydrogen), making up around 24% of its mass. ... 
Unfortunately you'll need around 5000 of these balloons if you weigh around 
50kgs and ... Because helium is less dense than normal air, when inhaled from a 
source... [DOC] [TLE] How many times heavier is helium than hydrogen? - Quora [PAR] It depends if you are talking about the diatomic form of hydrogen or just hydrogen 
atoms. ... How were the heavy elements from iron to uranium made? ... more than 
helium's two electrons, each of which weighing only 1/1840 of that of a ... atomic 
mass of hydrogen is 1.008, then hydrogen is how many times less than carbon? [DOC] [TLE] Graphene aerogel is seven times lighter than air, can balance on a ... [PAR] Apr 10, 2013 ... A cubic centimeter of the graphene aerogel weighs just 0.16 milligrams  or, if 
you're having ... The cube, which is roughly an inch across, probably weighs less 
than 5 milligrams. ... Maybe it's lighter than air only on void, but in the photos it's 
filled with air. .... This is why helium balloons float upwards in air. [DOC] [TLE] Is the whole the sum of its parts?  Einstein Online [PAR] Energy

Question: It's the only element that weighs less than helium
Answer: Hydrogen