Changes

'''Lutetium''' is the hardest and densest of the [[rare earth metals]].  It has two stable isotopes (actually one, but another one has a [[half-life]] of over 10¹⁰ years).

'''Lutetium''' is the hardest and densest of the [[rare earth metals]].  It has two stable isotopes (actually one, but another one has a [[half-life]] of over 10¹⁰ years).

Lutetium was discovered in 1907 by Georges Urbain and others, after being separated from ytterbium.  This brought to a close a long period of confusion about whether the (very similar) elements ytterbium, terbium, and erbium were different, and which one was which.

Lutetium was discovered in 1907 by Georges Urbain and others, after being separated from [[ytterbium]].  This brought to a close a long period of confusion about whether the (very similar) elements [[ytterbium]], [[terbium]], and [[erbium]] were different, and which one was which.

[[Category:Elements]]

[[Category:Elements]]

{{Periodic table}}

{{Periodic table}}