វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
តូច
មធ្យម
ធំ
Columbium
ENGLISH MEANING
noun
1.
A
rare
element
of the
vanadium
group
,
first
found
in a
variety
of the
mineral
columbite
occurring
in
Connecticut
,
probably
at
Haddam
.
Atomic
weight
94.2.
Symbol
Cb or Nb.
Now
more
commonly
called
niobium
.