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What are atoms made of? What is keeping a nucleus intact? What happens if you try to separate two quarks? Are quarks fundamental? Read the illustrated and animated story about the interior of matter ...
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
More information on how GPS satellites calculate your location, from using accurate atomic clocks to ensuring enough coverage.
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.
A simple page on atomic structure. Aimed at GCSE level, but suitable for anyone.
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