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RARE GASES Here is a mnemonic sentence for the order (by atomic weight) of the rare gas elements in the chemical Periodic Table. The rare gases form "Group O", always the first vertical column of the table. Heaven Never Asked Kriegspiel's Extra Rent He Ne A Kr Xe Rn(helium, neon, argon, krypton, xenon, radon) All matter consists of atoms of one or another element such as hydrogen (H) or oxygen (O), often combined into compounds (as in H2O=water). The elements are set in a Periodic Table in the order of their atomic weights (starting with hydrogen, the lightest) following Mendeleev's Periodic Law, which states that "the properties of the elements are in periodic dependence upon their atomic weights" - in other words, elements either eight or ten places apart have many properties in common. See rare earths for the order of rare earth elements and periodic elements for mnemonic sentences governing the order of elements in general. For those completely unfamiliar with the Periodic Table itself, it is reproduced below in full.
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