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Answer for the clue "Such as, eg, radon or neon ", 9 letters:
noble gas

Word definitions for noble gas in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.

WordNet Word definitions in WordNet
n. any of the chemically inert gaseous elements of the helium group in the periodic table [syn: inert gas , argonon ]

Wikipedia Word definitions in Wikipedia
This page provides supplementary data about the noble gases , which were excluded from the main article to conserve space and preserve focus.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Noble \No"ble\, a. [Compar. Nobler ; superl. Noblest .] [F. noble, fr. L. nobilis that can be or is known, well known, famous, highborn, noble, fr. noscere to know. See know .] Possessing eminence, elevation, dignity, etc.; above whatever is low, mean, ...

Usage examples of noble gas.

Interfered with, they dissolved much more quickly: in a noble gas more slowly.

He is not intrigued or impressed by the fact that a noble gas like xenon can form compounds--something that until recently most chemists swore was impossible.

Mercy saw every kind of solar power cell, small fusion units, collapsible vehicles, a shrouded thing labeled LINK-BELT MINIMINER, another called FAIRBANKS MORSE MARINE ION CONCENTRATOR, a third designated NOBLE GAS ATMOSPHERIC EXTRACTOR, MITSUBISHI HI LTD.