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Which expensive noble gas can be used as an environmentally friendly, rapid-acting inhalational anesthetic?

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Correct answer: Xenon

Xenon is an ideal anesthetic because it is non-toxic, odorless, does not harm the environment, and allows for extremely fast recovery. However, because it must be extracted from the atmosphere in tiny amounts, its high cost limits its widespread daily use. Photo: Alchemist-hp (talk) (www.pse-mendelejew.de), Wikimedia Commons, FAL.

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Source: Wikipedia (CC BY-SA)

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