Atomic symbol: Er
Atomic number: 68
Atomic mass: 167.26
Appearance: Silvery white solid at 25°C
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹² 6s² Malleable and ductile.
Used in alloys, colorings, and in nuclear control rods.
Fun Fact! Erbium is used in medical lasers for skin resurfacing procedures like tattoo/ mole/ wart removal, scar and stretch marks aesthetics, and in dentistry.