Changes

'''Hafnium''' is considered to be non-toxic. When in powder form it is [[pyrophoric]] (which means, it can spontaneously ignite).

'''Hafnium''' is considered to be non-toxic. When in powder form it is [[pyrophoric]] (which means, it can spontaneously ignite).

==Properties==

==Properties==

Hafnium is a shinny, [[ductile]] (that is, it can be drawn out into wire) [[metal]]. Chemically this is very similar to the element [[zirconium]]. Hafnium is unaffected by all alkalis and all acids other than from hydrogen fluoride. It does reacts with the [[halogens]] to form [[tetrahalides]], and at high temperatures it reacts with [[carbon]], [[boron]], [[oxygen]],  [[nitrogen]], [[sulfur]] and [[silicon]]. <ref>http://www.chemicool.com/elements/hafnium.html</ref>

Hafnium is a shiny, [[ductile]] (that is, it can be drawn out into wire) [[metal]]. Chemically this is very similar to the element [[zirconium]]. Hafnium is unaffected by all alkalis and all acids other than from hydrogen fluoride. It does reacts with the [[halogens]] to form [[tetrahalides]], and at high temperatures it reacts with [[carbon]], [[boron]], [[oxygen]],  [[nitrogen]], [[sulfur]] and [[silicon]]. <ref>http://www.chemicool.com/elements/hafnium.html</ref>

==Uses==

==Uses==

Pure Hafnium is used primarily in nuclear reactor control rods.  However, it's alloys are much more useful. Hafnium carbide is used to line high temperature furnaces, for example. <ref>http://www.chemicool.com/elements/hafnium.html</ref>

Pure Hafnium is used primarily in nuclear reactor control rods.  However, its alloys are much more useful. Hafnium carbide is used to line high temperature furnaces, for example. <ref>http://www.chemicool.com/elements/hafnium.html</ref>

{{Template:Periodic table}}

{{Template:Periodic table}}

[[Category:Elements]]

[[Category:Elements]]

[[Category:Metals]]

[[Category:Metals]]