Element Californium

Californium ElementThe element was first synthesized in 1950 at the Lawrence Berkeley National Laboratory (then the University of California Radiation Laboratory), by bombarding curium with alpha particles (helium-4 ions).
It is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium).
The element was named after the university and the state of California.
Californium is a radioactive chemical element with the symbol Cf and atomic number 98.
Californium is a silvery white actinide metal with a melting point of 900 ± 30 °C (1,650 ± 50 °F) and an estimated boiling point of 1,745 K (1,470 °C; 2,680 °F).
The pure metal is malleable and is easily cut with a razor blade.

Names and Identifiers

Chemical Formula:Cf
CAS:7440-71-3
Molecular Weight:251.08000 g/mol
EC Number :n/a
MDL Number:n/a
Color:silvery-white/ unknown
Other Names:Californio
PubChem CID:23997
IUPAC Name:Californium
Inchl:InChI=1S/Cf
InChI Key:HGLDOAKPQXAFKI-UHFFFAOYSA-N
Canonical SMILES:[Cf]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:15.1 g/cm³
Boiling Point:1743 K ​(1470 °C, ​2678 °F)
Melting Point:1173 K ​(900 °C, ​1652 °F)
Molecular Formula:Cf
Flash Point:n/a
Exact Mass:251.08000

Twenty radioisotopes of californium have been characterized, the most stable being californium-251 with a half-life of 898 years, californium-249 with a half-life of 351 years, californium-250 with a half-life of 13.08 years, and californium-252 with a half-life of 2.645 years

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
248Cf248.07218334 dα to 244Cm; SF0
249Cf249.07485351 yα to 245Cm; SF9/2
250Cf250.0764013.1 yα to 246Cm; SF0
251Cf251.079580 (5)898 yα to 247Cm1/2
252Cf252.081622.64 yα to 248Cm; SF0
253Cf253.0851317.8 dα to 249Cm; β to 253Es7/2
254Cf254.0873260.5 dα to 250Cm; SF0
255Cf255.09101.4 hβ to 255Es

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