scandium
n . 金属元素之一,符号为
Sc ,原子序为
21 金属元素之一,符号为
Sc ,原子序为
21 scandium n 1 :
a white trivalent metallic element ;
sometimes classified in the rare earth group ;
occurs in the Scandinavian mineral thortveitite [
synonym : {
scandium }, {
Sc }, {
atomic number 21 }]
Scandium \
Scan "
di *
um \,
n . [
NL .
So called because found in Scandinavian minerals .] (
Chem .)
A rare metallic element of the boron group ,
whose existence was predicted under the provisional name {
ekaboron }
by means of the periodic law ,
and subsequently discovered by spectrum analysis in certain rare Scandinavian minerals (
euxenite and gadolinite ).
It has not yet been isolated .
Symbol Sc .
Atomic weight 44 .
[
1913 Webster ]
Ekabor \
Ek "
a *
bor `\ ([
e ^]
k "[.
a ]*
b [=
o ]
r `),
Ekaboron \
Ek "
a *
bo "
ron \
(-
b [=
o ]"
r [
o ^]
n ),
n . [
G .,
fr .
Skr . [=
e ]
ka one G .
bor ,
boron ,
E .
boron .] (
Chem .)
The name given by Mendelejeff in accordance with the periodic law ,
and by prediction ,
to a hypothetical element then unknown ,
but since discovered and named {
scandium }; --
so called because it was a missing analogue of the boron group .
See {
Scandium }.
[
1913 Webster ]
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