Neptunium is an actinide having 7 valence electrons. Let us explore its electronic configuration.

**The electronic configuration of Np is [Rn] 5f ^{4} 6d^{1} 7s^{2}. Np has a half-life of 2.144 million years and is majorly synthesized artificially. Edwin McMillan and Philip Abelson were the discoverers of Np.**

Np has 93 electrons systematically distributed into various shells. In this article, we will be discussing about the electronic configuration of Np.

**How to write neptunium electron configuration**

**The electronic configuration of Np is [Rn] 5f ^{4} 6d^{1} 7s^{2}, with atomic number 93 which is written according to Aufbau’s principle**

**as follows**.

**S orbital can at max have 2 electrons****P orbital can accommodate 6 electrons****D orbital can have 10 electrons, and****F orbital can accommodate 14 electrons.**

**Neptunium electron configuration diagram**

**The electronic configuration of Np is [Rn] 5f ^{4} 6d^{1} 7s^{2}, which can be drawn as follows-**

**Neptunium electron configuration notation**

**The electron configuration notation of Np is written as follows-**

**[Rn] 5f**^{4}6d^{1}7s^{2}**as per noble gas Radon.**

**1s**^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}5f^{4}6s^{2}6p^{6}6d^{1}7s^{2}**in terms of orbitals**.

**Neptunium unabbreviated electron configuration**

**The unabbreviated electron configuration of Np is 1s ^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}5f^{4}6s^{2}6p^{6}6d^{1}7s^{2}**

**Ground state neptunium electron configuration**

**The ground state electronic configuration of Np is 1s ^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}5f^{4}6s^{2}6p^{6}6d^{1}7s^{2}**

**Excited state of neptunium electron configuration**

**The excited state of Np electron configuration is 1s ^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}5f^{4}6s^{2}6p^{6}6d^{0}7s^{2}7p^{1}**

**Ground state neptunium orbital diagram**

**The ground state electronic configuration of Np is 1s ^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}5f^{4}6s^{2}6p^{6}6d^{1}7s^{2} which is drawn as follows-**

#### Conclusion

Np has 24 available isotopes out of which ^{237}Np is the most stable isotope. Np is named after Neptune (the planet) and shows radioactivity. Np is an amphoteric oxide and shows +2,+3,+4,+5,+6, and +7 oxidation states.