Ytterbium

Ytterbium 173.04(3)   Yb 70 1s22s22p63s23p63d104s24p6 4d105s25p64f146s2 [ ? ] Lanthanide: Properties: Soft, bright silvery luster, malleable and ductile metal.

Ytterbium is a chemical element, having the chemical symbol Yb. Its atomic number (the number of protons) is 70. It has a standard atomic weight of 173.04 g•mol ⁻¹ and is a solid in its elemental form.

Ytterbium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 1,196°C and a melting point of 819 °C.