Curium

Analytical testing dots

Curium (pronounced /ˈkjuːriəm/) is a synthetic chemical element with the symbol Cm and atomic number 96. A radioactive metallic transuranic element of the actinide series, curium is produced by bombarding plutonium with alpha particles (helium ions) and was named for Marie Curie and her husband Pierre.

 

General
Name, Symbol, Number curium, Cm, 96
Chemical series actinides
Group, Period, Block n/a, 7, f
Appearance silvery
Standard atomic weight (247) g·mol-1
Electrons per shell 2, 8, 18, 32, 25, 9, 2
Physical properties
Phase solid
Density (near r.t.) 13.51 g·cm−3
Melting point 1613K
(1340°C, 2444°F)
Boiling point 3383K
(3110°C, 5630°F)
Heat of fusion  ? 15 kJ·mol-1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 1788 1982        
Atomic properties
Crystal structure hexagonal close-packed
Oxidation states 3
(amphoteric oxide)
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: 581 kJ/mol
Miscellaneous
Magnetic ordering no data
CAS registry number 7440-51-9

 

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