Californium ( CF ) :

Define: Californium is inner transition metal  and place at 9th number in actinides series. It is man made element and 6th number  transuranic element. It is radioactive element . It is 2nd number  highest atomic weight element. It is toxic in nature .it is emits 70 neutron in 1 minute .

Discovery : it is discovered in 1950 by scientist Stanley Thompson ,Kenneth street , Jr. Albert Ghiorso ,Glenn seaborg.

Origin of name :the name gives after the university and state of California . Where the element was first made .

Physical properties :

Atomic symbol: Atomic symbol of Californium is Cf

Atomic number : Atomic number of Californium is 98

In Californium 98 proton and 98 electron is present.

Atomic weight/ mass: Atomic weight of Californium is 251.08 Amu

In Californium 98 proton and 153 neutron is present.

Position : it is place in periodic table at 7th period and actinides group

Block : it is place in f block

Colour :Californium show silvery white colour

State : Californium present in solid form

Boiling point : boiling point of Californium is 1472 0C

Melting point :melting point of Californium is 900 C


  • 249Cf: atomic weight of this isotope is 249.07 Amu

In this isotope 98 proton ,98 electron and  151neutron

  • 250Cf: Atomic weight of this isotope is 250.04 Amu

In this isotope 98 proton, 98 electron and 152 neutron

  • 251Cf: atomic Weight of this isotope is 251.08 Amu

In this isotope 98proton ,98 electron and 153 neutron is present

  • 252Cf: atomic weight of this isotope is 252.07 Amu

In this isotope 98 proton, 98 electron and 154 neutron is present

Chemical properties :

Electronic configuration

Electronic configuration of californium is [ Rn ] 5f107s2

Electronic configuration in concert of shell is 2,8,18,32,28,8,2

Electronic structure

Valency : Valency of californium is 2 or 3

Atomic radius : Atomic radius of californium is 245 Pm


  • It is use as neutron emitters
  • It is use in metal detector to detect hold and silver ores
  • It is also use to detect water and oil layer in oil mines
  • Californium use in nuclear reactor
  • It is use as rocket fuel
  • It Isotope used in neutron source .


Question and Answer:

Q1. Define Californium

Q2. Who discovered Californium?

Q2. Physical properties of Californium

Q4. Write Atomic Symbol of Californium.

Q5. Write the Atomic number of Californium.

Q6. On which block Californium element is present?

Q7. What is the color of Californium?

Q8. What is the Boiling point of Californium?

Q9. What is the Melting point of Californium?

Q10. Write the Isotopes of Californium.

Q11. Show Electronic configuration of Californium.

Q12. Write Electronic Structure of Californium.

Q13. What is the Valency of Californium?

Q14. Write the uses of Californium element.

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