
Promethium (Pm) Element
Basic Information | |
Name: Promethium Symbol: Pm Atomic Number: 61 Atomic Mass: (145.0) amu Melting Point: Unknown Boiling Point: Unknown |
Number
of Protons/Electrons: 61 Number of Neutrons: 84 Classification: Rare Earth Crystal Structure: Hexagonal Density @ 293 K: 6.475 g/cm3 Color: Unknown |