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The database contains data for transitions and energy levels in atoms and atomic ions, including transitions of 99 elements and energy levels of 51 elements.
The key to classifying a galaxy as a Seyfert Galaxy is the presence of broad emission lines from the bright, star-like nucleus. They are often strong radio and infrared sources. The first such active ...
A force which can hold a nucleus together is strong indeed.
How to calculate atomic, molecular and formula masses
This site gives an overview of atomic and subatomic physics.
Designed by students as part of the ThinkQuest competition, this site provides a teaching course on three levels explaining the atomic and quantum world.
This site gives an overview of the physics of the atom through a series of links to relevant articles.
A simple page on atomic structure. Aimed at GCSE level, but suitable for anyone.
An introduction to time keeping and how time is agreed around the world.
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