The Noble Gases Helium, Neon, Argon, Krypton, Xenon

The Noble Gases Helium, Neon, Argon, Krypton, Xenon and Radon 

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Likewise, lithium, sodium, potassium, rubidium, and cesium (the alkali metals) exhibit many similar properties, and the noble gases (helium, neon, argon, krypton, xenon, and radon) are all very nonreactive. 

Periodic table of the elements. The lanthanide series ( rare earths ), beginning with lanthanum (57), and the actinide series, which begins with actinium (89) and includes thorium (90) and uranium (92), are chemically similar. Other families of elements read vertically down the table—at the far right, for example, the noble gases helium, neon, argon, krypton, xenon, radon. 

The noble gases helium, neon, argon, krypton, xenon, and radon. 

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