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Atomic Spectra Databases

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.

http://physics.nist.gov/PhysRefData/ASD1/choice.html?nist_atomic_spectra.html

Atomic Mass Units

What is atomic mass

http://www.colorado.edu/physics/2000/periodic_table/atomic_mass.html

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 ...

http://hyperphysics.phy-astr.gsu.edu/hbase/astro/galax.html#c3

Strong Force

A force which can hold a nucleus together is strong indeed.

http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html#c2

Atomic, Molecular and Formula masses

How to calculate atomic, molecular and formula masses

http://www.carlton.srsd119.ca/chemical/molemass/

Atoms, Nuclei, Particles, & Other Small Things

This site gives an overview of atomic and subatomic physics.

http://physics.about.com/od/atomsparticles/Atoms_Nuclei_Particles_Other_Small_Things.htm

Quanta and atoms - the elementary approach

Designed by students as part of the ThinkQuest competition, this site provides a teaching course on three levels explaining the atomic and quantum world.