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hafnium    音標拼音: [h'æfniəm]
n. 鉿

鉿

hafnium
n 1: a grey tetravalent metallic element that resembles
zirconium chemically and is found in zirconium minerals;
used in filaments for its ready emission of electrons [synonym:
{hafnium}, {Hf}, {atomic number 72}]

hafnium \haf"ni*um\ (h[a^]f"n[=e]*[u^]m or h[aum]f"n[=e]*[u^]m),
n.
A metallic element of atomic number 72 present together with
zirconium to the extent of 1% to 5% in zirconium minerals. It
is a poisonous, ductile metal with a brilliant silver luster,
has an atomic weight of 178.49, and has a high melting point
(2227[deg] C). It is used in nuclear reactors, and
incandescent lamps as a scavenger of oxygen and nitrogen. See
also {norium}.
[1913 Webster]

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