hydrogen
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By Pumbaa (original work by Greg Robson) - Application: (generated by script), CC BY-SA 2.0 uk
noun
a
colorless
,
odorless
,
highly
flammable
gas
, the
chemical
element
of
atomic number
1
. (Symbol:
H
)
Hydrogen is the
lightest
of the
chemical element
s and has the
simplest
atomic structure
, a single
electron
orbiting a
nucleus
consisting of a single
proton
. It is by far the commonest element in the
universe
, although not on the
earth
, where it occurs chiefly combined with
oxygen
as
water
.
〘化〙 水素〘非金属元素; ｟記号｠ H〙
DERIVATIVES
hydrogenous
|hīˈdräj(ə)nəs| adjective
ORIGIN
late
18th century
: coined in
French
from
Greek
hudro-
‘
water
’ +
-genēs
(see
-gen
).