Curium

Identity

Atomic number

96

Symbol

Cm

Canonical name

Curium

Category

actinide

Group

unassigned

Period

7

Block

f

Series set apart from the main table. Whether group 3 is lanthanum or lutetium (actinium or lawrencium) is still discussed, so the group is left empty.

Properties

These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.

Atomic mass

[247] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.

Electron configuration

[Rn] 5f7 6d1 7s2

Electrons per shell

2, 8, 18, 32, 25, 9, 2

Standard state

solid

Density

13.51 g/cm³

Melting point

1,613 K

Boiling point

3,383 K

Electronegativity

1.28 Pauling

First ionization energy

581 kJ/mol

Electron affinity

27.17 kJ/mol

Notable isotopes

This summary is not an inventory of every isotope.

Conventional mass number: 247

History

See the element timeline

Etymology

Theme

scientist

Language

latin

Root

Curie

Meaning

Pierre and Marie Curie

Scientists

• Glenn T. Seaborg
• Ralph A. James
• Albert Ghiorso

Places and institutions

• Berkeley Radiation Laboratory, later Lawrence Berkeley National Laboratory

• Berkeley — historical setting : United States — present country : United States

See also

• 94 Plutonium (Pu)
• 95 Americium (Am)
• 97 Berkelium (Bk)
• 98 Californium (Cf)
• 99 Einsteinium (Es)
• 100 Fermium (Fm)
• 101 Mendelevium (Md)
• 103 Lawrencium (Lr)

Sources

• IUPAC, Periodic Table of the Elements
• Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
• IUPAC, décisions sur la priorité et les noms des éléments transfermiens (1997–2016)