How did the element,Radon, get its name and its symbol?

Hello.

"Radon" was originally known as "radium emanation." In 1910, a
scientist named Ramsay proposed the name "niton" from the Latin word
"nitens" (shining). In 1918, though, a scientist named Schimdt
proposed the name "radon" from "radium" plus "-on," the suffix of
inert gases (as in neon, argon, etc.).

In 1923, the International Committee for Chemical Elements adopted
Schmidt's   "radon" proposal and selected the symbol "Rn" (an obvious
contraction of "Radon").

source:
Radon
Elementymology & Elements Multidict by Peter van der Krogt
http://www.vanderkrogt.net/elements/elem/rn.html

Also see:
Etymology Online - Radon
http://www.etymonline.com/index.php?term=radon

Also see:
BBC - Noble Gases
http://www.bbc.co.uk/dna/getwriting/A2342189

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search strategy:
"name radon"
radon, niton, "radium emanation"

I hope this helps.

Thanks for you speedy response.