Lutetium

= Lutetium  =  

 **Symbol:** Lu  **Electron configuration:** Xe 4f14 5d1 6s2  **Atomic number:** 71  <span class="_xdb">**Discovered:** <span class="_Xbe kno-fv">1907 <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"> <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"><span class="_xdb">**Melting point:** <span class="_Xbe kno-fv">3,025°F (1,663°C) <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"> <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"><span class="_xdb">**Boiling point:** <span class="_Xbe kno-fv">6,143°F (3,395°C) <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"> <span style="background-color: #ffffff; color: #222222; display: block; font-family: arial,sans-serif;"><span class="_xdb">**Atomic mass:** <span class="_Xbe kno-fv">174.967 ± 0.001 u

By Fagen Hoffman