71Lu174.97
Lutetium
LanthanidesRare-earth metals used in strong magnets, phone screens and lasers.
[Xe] 4f¹⁴ 5d¹ 6s²
- Atomic number
- 71
- Atomic mass
- 174.97
- Protons
- 71
- Neutrons
- 104 (most common)
- Electrons
- 71
- Shells
- 2, 8, 18, 32, 9, 2
- State at 25 °C
- Solid
- Position
- Period 6, f-block
Proton (+)Neutron (0)Electron (−)
Discovered byGeorges Urbain, 1907Georges Urbain: 1 element
Named after Lutetia, the old Roman name for Paris.
Did you know?
- It is the last of the lanthanides.
- It is one of the most expensive rare-earth metals.
Where it's found
- Rare-earth ores
What it's used for
- PET scanner detectors
- Targeted cancer treatment
Try it
There's no safe home experiment for Lutetium. Explore it with the animated atom above instead.