[DOC] [TLE] ELEMENTS: Z1-Z10 [PAR] (Greek helios, "sun"), symbol He, inert, colorless, odorless gaseous element. ... 
Helium is the most difficult of all gases to liquefy and is impossible to solidify at... [DOC] [TLE] HELIUM [PAR] Helium has the distinction of being the only element discovered outside of ... 
Helium is the most difficult of all gases to liquefy and is impossible to solidify at... [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. ... Most helium in the universe is helium-4, and is believed to have 
been formed... [DOC] [TLE] Helium - Jessica Magers-Rankin [PAR] Helium is an inert, colorless, odorless, gaseous element. ... Helium's atomic 
number is 2 and it's symbol is He. ... Helium is the lightest of all gases except 
hydrogen. ... Helium is the most difficult gas to liquefy and is impossible to solidify 
at... [DOC] [TLE] Helium symbol He inert colorless odorless gaseous element In ... [PAR] difficult and the resulting compounds quite unstable. Helium is the most difficult of 
all gases to liquefy and is impossible to solidify. These properties make liquid... [DOC] [TLE] Helium, Chemical Element - structure, uses, elements, metal, gas ... [PAR] Helium is the second most abundant element in the universe. Only hydrogen ... 
He found proof that a new element existed in the Sun. He called the element 
helium. SYMBOL He. ATOMIC .... All of the gases in air have liquefied in liquid air
. If the liquid ... The easiest way to do that is to pump a gas into the system. But 
the gas... [DOC] [TLE] atomic number 2 - Memidex dictionary/thesaurus [PAR] ... element that is one of the 6 inert gasses. the most difficult gas to liquefy. occurs 
... and inert gas, and the second lightest chemical element (symbol He) with an... [DOC] [TLE] Element, chemical - definition of element, chemical by The Free ... [PAR] Noun 1. chemical element - any of the more than 100 known substances that 
cannot be ... an atomic number greater than 92 (which is the atomic number of 
uranium); all are radioactive ... atomic number 2, He, helium - a very light 
colorless element that is one of the six inert gasses; the most difficult gas to 
liquefy; occurs in... [DOC] [TLE] Element 2 - definition of Element 2 by The Free Dictionary [PAR] Symbol He A colorless, odorless inert gaseous element occurring in natural gas 
... We now know that helium is produced abundantly by the nuclear fusion in all 
stars, ... element that is one of the six inert gasses; the most difficult gas to liquefy;
... [DOC] [TLE] Associations to the word Helium - Word Associations Network [PAR] ... and inert gas, and the second lightest chemical element (symbol He) with an ... 
(star) A star which has lost most or all of its hydrogen, leaving just a core of 
helium. ... element that is one of the six inert gasses; the most difficult gas to 
liquefy;... [DOC] [TLE] helium-4 nedir, ne demek, helium-4 anlam - Sesli Szlk [PAR] ... and inert gas, and the second lightest chemical element (symbol He) with an 
atomic ... A star which has lost most or all of its hydrogen, leaving just a core of 
helium ... element that is one of the six inert gasses; the most difficult gas to 
liquefy;... [DOC] [TLE] helium  |  [PAR] Helium \He"li*um\ (h[=e]"l[i^]*[u^]m), n. [NL., fr. Gr. "h`lios the sun.] (Chem.) An 
inert, monoatomic, gaseous element occurring in the atmosphere of the sun and
... [DOC] [TLE] helium - definition, etymology and usage, examples and related words [PAR] n helium a very light colorless element that is one of the six inert gasses; the most

Question: This element, symbol He, is the most difficult of all gases to liquefy
Answer: helium