Radon
Definition of Radon
Ra´don
Pronunciation:
rā´dǒn
n.
1.
(Chem.)
An
intensely
radioactive
gaseous
element
produced
by
the
radioactive
decay
of
radium-226
,
which
is
the
main
isotope
of
radium
found
in
pitchblende
.
Chemically
it
is
an
inert
noble
gas
.
Its
atomic
symbol
is
Rn
.
It
has
an
atomic
number
of
86
.
The
radon
isotope
produced
by
decay
of
radium
has
an
atomic
weight
of
222
.
017
,
and
this
isotope
decays
by
alpha
emission
with
a
half-life
of
3
.
82
days
.
Numerous
other
isotopes
have
been
observed
,
all
radioactive
and
all
having
half-lives
shorter
than
that
of
radon-222
.
Radon
was
discovered
by
M
.
and
Mme
.
Curie
,
of
Paris
,
in
their
studies
of
the
radioactive
substances
in
pitchblende
.
Radon
was
originally
called
radium
emanation
or
exradio
.
Related Words
argonon
,
atomic
number
86
,
chemical
element
,
element
,
inert
gas
,
noble
gas
,
Rn
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Radiophony
Radiopticon
Radioscopy
Radiotelegram
Radiotelegraph
Radiotelegraphic
Radiotelegraphy
Radiotelephone
Radiotherapy
radiothorium
radious
Radish
Radish fly
Radium
Radius
Radius bar
Radius of curvature
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Radius vector
Radix
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Radula
Raduliform
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Raff merchant
Raffaelesque
Raffia
Raffia palm
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Raffle
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Rafflesia
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Raftsman
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