Sunday, 25 September 2011

MOLECULE

A molecule is a discrete unit made from atoms joined together by chemical bonds. All molecules, of the same component are identical. All water molecules, for example, consist of an atom of oxygen, chemically bound to two hydrogen atoms. Molecules may consist of just two atoms, or many thousands.
A Bohr model of the hydrogen atom, showing an electron jumping between fixed orbits and emitting a photon of energy with a specific frequency.


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