Lutetium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 71
Element Lutetium
Symbol Lu
Atomic Mass 174.967 u
Number of Neutrons 104 (most common isotope, Lutetium-175)
Number of Protons 71
Number of Electrons 71
Period 6
Group 3
Phase Solid
Radioactive No (Lu-176 is naturally radioactive)
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Lanthanide
Atomic Radius 217 pm
Electronegativity 1.27 (Pauling scale)
First Ionization Energy 5.426 eV
Density 9.84 g/cm³
Melting Point 1663 °C
Boiling Point 3402 °C
Number of Isotopes 2 naturally occurring (Lu-175, Lu-176)
Discoverer Georges Urbain, Carl Auer von Welsbach, Charles James
Year 1907
Specific Heat 0.154 J/g·K
Number of Shells 6
Number of Valence Electrons 3
Tags: Tutorials Chemistry tutorial step by step learn how to guide examples
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