Neptunium ( Np ):

Define: Neptunium is inner transition metal place at 4th number in actinides series. It is radioactive element and 1st transuranic element ( the element which have atomic number greater than 92 means atomic number greater than  uranium is called transuranic element) .  It is ductile in nature. And toxic .it is man made element . It is found as by product in nuclear reactor in small amount from uranium ores

Discovery :.  It is discovered in 1940 by scientist Edwin McMillan and philp

Origin of name : the name gives after the planet Neptune.

Physical properties :

Atomic symbol: Atomic symbol of neptunium is Np

Atomic number : Atomic number of Neptunium is 93

In neptunium 93 proton and 93 electron is present

Atomic weight/ mass: atomic mass of 237 .05 Amu

In neptunium 93 proton and 144 neutron is present

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

Block : it is place in f block

Colour : neptunium show silvery colour

State : neptunium show solid form in nature

Boiling point :Boiling point of Neptunium is 3902 0C

Melting point :melting point of Neptunium is 644 0C


  • 236Np: atomic weight of this isotope is 236.04 Amu

In this isotope 93 proton ,93 electron and 143 neutron is present

  • 237Np: atomic weight of this isotope is 237.04 Amu

In this isotope 93 proton, 93 electron and 144 neutron is present

Chemical properties :

Electronic configuration

Electronic configuration of Neptunium is [ Rn ] 5f4 6d1 7s2

Electronic configuration of Neptunium is 2,8,18,32,22,9,2

Electronic structure

Valency : Valency of Neptunium is 3,4,or 5

Atomic radius : Atomic radius of Neptunium is 175 Pm


  • Neptunium 237 isotope use in neutron detector
  • It is use in making plutonium – 230 isotopes
  • It is use to make atomic bomb
  • It is generally use in research field


Question and Answer:

Q1. Define Neptunium

Q2. Who discovered Neptunium?

Q2. Physical properties of Neptunium

Q4. Write Atomic Symbol of Neptunium.

Q5. Write the Atomic number of Neptunium.

Q6. On which block Neptunium element is present?

Q7. What is the color of Neptunium?

Q8. What is the Boiling point of Neptunium?

Q9. What is the Melting point of Neptunium?

Q10. Write the Isotopes of Neptunium.

Q11. Show Electronic configuration of Neptunium.

Q12. Write Electronic Structure of Neptunium.

Q13. What is the Valency of Neptunium?

Q14. Write the uses of Neptunium element.

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