On Aug 13, 2007, at 12:45 AM, Man-wai Chang wrote:

> Chemical composition? Is it neutron, proton and electroncs? Or some
> older definitions?

        Chemistry deals only with electrons, and the bonds formed by sharing  
these electrons, or by the attraction/repulsion caused by electric  
charge. The atoms, which are defined by their nuclei, never change.

-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com




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