Element Erbium (Er)

Atomic number 68 · lanthanide · Atomic mass 167.26 u

Atomic Mass
167.2600 u
Element Properties
Atomic Number 68
Atomic Mass 167.2600 u
Category lanthanide / 镧系元素
Group
Period 6
Block F
Electron Configuration [Xe] 4f¹² 6s²
Electronegativity (Pauling) 1.24
Phase at STP Solid
Density 9.066 g/cm³
Year Discovered 1843

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