Noble gases, Chemistry

 

NOBEL GASES

With their closed-shell electron design the noble gas elements of group 18 were long regarded as chemically inert. However, in 1962 Bartlett pinpoint that the ionization energy of xenon was same to that of O2, and by reaction with PtF6 attempted to build the compound analogous to [O2]+[PtF6]-. He collect a complex product having the ion [XeF]+ rather than the required Xe+. Many substance of xenon are now known, widely with O and F, and few of krypton.

The gases are not usually abundant on Earth, although argon (formed by the radioactive decay of 40K) built up helium (formed by radioactive decay of uranium and thorium and about 1 mol % of the atmosphere occurs in natural gas. Radon is radioactive, 222Rn have a half-life of 3.8 days also being produce by radioactive decay from 238U. The boiling points of the elements display the trend expected from van der Waals' forces, that of helium (4.2 K) being the lowest of any element. Helium is also single as it does not solidify except under pressure; the remaining substance form monatomic solids with close-packed structures. Liquid helium is required for maintaining very low temperatures, argon as an inert gas in different metallurgical processes, and all the substance in gas discharge tubes.

 

Posted Date: 7/23/2012 7:16:33 AM | Location : United States







Related Discussions:- Noble gases, Assignment Help, Ask Question on Noble gases, Get Answer, Expert's Help, Noble gases Discussions

Write discussion on Noble gases
Your posts are moderated
Related Questions
It is stated that Bohrs theory is applicable to hydrogen like ions.why? Ans) It is not stated in bohr''s theory but it is a drawback of his theory. The reason for this is

Q.give characterstics of matter?

#question.what is chemical structures and names of first 20 mono carboxylic acid? .

WHY WE CALCULATE GERM OIL ACIDITY OF WHEAT FLOUR?

The number of electrons involved in the bond formation of N 2   molecule : (1) 2   (2) 4    (3) 6                               (4) 10 Ans: 6


how much glucose C6H12O6 you need to start with to prepare 4.6 times 10 to power 4 Kg of C2H5OH if the yield in the reaction is %64.5 C6H12O6+3O2= 4CO2+C2H5oh+3H2O

mechanism of picricacids

lithium and beryllium markedly differ from other members of their respective groups

ABAOUT ANY MAGNATIC CALCULATION OF TRANSAYION ELEMENT.