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
Q. Illustrate crystal field splitting in octahedral complexes? Initially in a free ion state (I) all the orbitals are in degenerate state. In state (11), all the five orbitals

what is the classification, applications and structures of azo dyes? how can they be removed from textile and other industrial effluents by semi-interpenetrating networks ?

The nature of bonding in graphite is: (1) Covalent                                       (2) Ionic     (3) Metallic (4) Coordinate Ans: Covalent

The reaction A ? B + C is known to be zero order in A and to have a rate constant of 5.0 x 10-2 mol/L·s at 25 oC. An experiment was run at 25 oC where [A]0 = 1.0 x 10-3 M. a)


laws of chemical combinations

What is this characterisation all about?and how do you do it using DNPH?

Calculate the Value for the Standard Molar Reaction Entropy? Derive an expression for the standard molar reaction entropy of a reaction that can be used to calculate its

Question 1: (i) With the aid of a diagram, briefly explain the natural environmental system. (ii) Explain the green house effect, and give 2 examples of green house gases