Abegg's rule

Abegg's rule
Abegg's rule states the sum of the absolute values of the maximum positive and negative valence of an atom is often equal to eight.
  •  Abegg’s rule is sometimes referred to as "Abegg’s law of valence and countervalence".
  • for a given chemical element (as sulfur) Abegg’s rule states that the sum of the absolute value of its negative valence (such as −2 for sulfur in H2S) and its positive valence of maximum value (as +6 for sulfur in H2SO4) is often equal to 8.
  • The rule used a historic meaning of valence which resembles the modern concept of oxidation state in which an atom is an electron donor or receiver.

Abegg, Richard Wilhelm Heinrich

  • January 9, 1869 – April 3, 1910
  • Danish chemist, major work on chemical valence
  • Trained as organic chemist (student of August Wilhelm von Hofmann at the University of Berlin); but practiced  physical chemistry with Friedrich Wilhelm Ostwald in Leipzig, Germany

Read More

  1. Abegg, R. (1904). "Die Valenz und das periodische System. Versuch einer Theorie der Molekularverbindungen (The valency and the periodical system - Attempt on a theory of molecular compound)". Zeitschrift für anorganische Chemie 39 (1): 330–380. doi:10.1002/zaac.19040390125.
  2. Lewis, Gilbert N. (1916-04-01). "THE ATOM AND THE MOLECULE". Journal of the American Chemical Society 38 (4): 762–785. doi:10.1021/ja02261a002.
  3. Pauling, Linus (1960-06). The Nature of the Chemical Bond and the Structure of Molecules and Crystals; An Introduction to Modern Structural Chemistry. (3 ed.). Cornell University Press. ISBN 0-8014-0333-2. 
  4. http://en.wikipedia.org/wiki/Abegg%27s_rule
  5. http://www.springerreference.com/docs/html/chapterdbid/206127.html
  6. http://en.wikipedia.org/wiki/Richard_Abegg

Sir Chandrasekhara Venkata Raman, FRS

Indian Scientist

Sir Chandrasekhara Venkata Raman, FRS
Sir Chandrasekhara Venkata Raman, FRS
Sir Chandrasekhara Venkata Raman, FRS (7 November 1888 – 21 November 1970) was an Indian physicist whose work was influential in the growth of science. He was the recipient of the Nobel Prize for Physics in 1930 for the discovery that when light traverses a transparent material, some of the deflected light changes in wavelength. This phenomenon is now called Raman scattering and is the result of the Raman effect.


The Raman papers archive curated by Raman Research Institute, Bangalore, India. C.V. Raman and his work

Read more at ACS
the-raman-effect-commemorative-booklet
Raman Effect as the Chemist’s Tool

This article from wikipedia: Read more at wikipedia

Scenario of Indian science

Indian research scenario
Some selected articles on Indian research scenario:

Chemistry: 
Chemistry is central science. This article describe current state of research and teaching in India.
Chemistry in India: unlocking the potential. Angew. Chem. Int. Ed. 2013, 52, 114 – 117
Read it at  DST, India  Wiley Readcube

Science:

Basic Science in India: From Education to Research, Nature Network
Research output  Changing scenario of Indian science  Indian R&D Scenario by AV Ramarao



Open Access Journals

'Open Access' is a buzz word in academics. Normally, It indicates free access to scientific article i.e. access without financial, legal, or technical barriers other than those inseparable from gaining access to the internet itself.[http://en.wikipedia.org/wiki/Open-access_journal]

 http://scholarlyoa.com/2012/11/30/criteria-for-determining-predatory-open-access-publishers-2nd-edition/


Directories/Tools:

The Organic Reactions Wiki

Organic Reaction
 Organic Reactions A comprehensive resource which provides information about the most important and useful synthetic reactions, organized primarily by reaction type. It contains mechanism, scope, and limitations of reactions for each reaction type. 

Based on this large work, there is freely accessible wiki which provides basic information about a reaction published in this collection. this can be accessed at http://organicreactions.org/index.php/Welcome_to_the_Organic_Reactions_Wiki_Home_Page