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1. halogen
noun.
(ˈhælədʒən)
Any
of
five
related
nonmetallic
elements
(fluorine
or
chlorine
or
bromine
or
iodine
or
astatine)
that
are
all
monovalent
and
readily
form
negative
ions.
Synonyms
iodine
fluorine
I
atomic number 85
Cl
F
grouping
atomic number 9
Br
chlorine
atomic number 53
atomic number 17
group
astatine
iodin
At
bromine
atomic number 35
Antonyms
fresh water
inactivity
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