Tecken	Lu
Atomnummer	71
Grupp	-
Period	6
Block	f
Ämnesklass	Lantanoid

Utseende	Silvery white
Färg	Silver

Antal protoner	71 p+
Antal neutroner	104 n0
Antal elektroner	71 e-

Från Wikipedia, den fria encyklopedinLutetium är ett grundämne som tillhör de sällsynta jordartsmetallerna. I enlighet med dess placering i det periodiska systemet tillhör lutetium övergångsmetallerna, men på grund av dess egenskaper placeras ämnet ofta bland lantanoiderna. Ämnet kallades tidigare särskilt i tysk litteratur cassiopeium, med kemiskt tecken Cp.

Fas vid STP	Fast
Densitet	9.841 g/cm3
Relativ atommassa	174.967 u

Smältpunkt	1925 K 1651.85 °C 3005.33 °F
Kokpunkt	3675 K 3401.85 °C 6155.33 °F
Ångbildningsvärme	355 kJ/mol

Elektronegativitet (Paulingskalan)	1.27
Elektronaffinitet	33.4 kJ/mol
Oxidationstal	0, +1, +2, +3 (a weakly basic oxide)
Jonisationspotential	523.5 kJ/mol 1340 kJ/mol 2022.3 kJ/mol 4370 kJ/mol 6445 kJ/mol

Elektronkonfiguration Kortfattad konfiguration	[Xe] 4f14 5d1 6s2
Elektronkonfiguration Full konfiguration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d1 6s2
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d1 6s2
Elektroner per skal	2, 8, 18, 32, 9, 2
Valenselektroner	2
Valency-elektroner	3
Bohrs atommodell	Figur: Skaldiagram över Lutetium (Lu) atom.
Orbitaldiagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s

Upptäckt	Carl Auer von Welsbach, Georges Urbain (1906)
Första isolation	Carl Auer von Welsbach (1906)
Namngivare	Georges Urbain (1906)
Upptäckten av lutetium Lutetium was independently discovered in 1907 by French scientist Georges Urbain, Austrian mineralogist Baron Carl Auer von Welsbach, and American chemist Charles James. All of these researchers found lutetium as an impurity in the mineral ytterbia, which was previously thought to consist entirely of ytterbium. The dispute on the priority of the discovery occurred shortly after, with Urbain and Welsbach accusing each other of publishing results influenced by the published research of the other; the naming honor went to Urbain, as he had published his results earlier. He chose the name lutecium for the new element, but in 1949 the spelling was changed to lutetium. In 1909, the priority was finally granted to Urbain and his names were adopted as official ones; however, the name cassiopeium (or later cassiopium) for element 71 proposed by Welsbach was used by many German scientists until the 1950s.

CAS Number	7439-94-3
ChemSpider ID	22371
EC number	231-103-0
PubChem CID Number	23929