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Neptunium (Np) – Element 93 of the periodic table

Neptunium (symbol Np) is element number 93 of the periodic table and belongs to the “Actinide” category. Its atomic mass is about 237, and its phase under standard conditions is Solid. This element sits in period 7 and the f-block (Actinides) of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 22, 9, 2. The short electron configuration of Neptunium is [Rn] 5f⁴ 6d¹ 7s². Known uses of Neptunium include Scientific research and Neutron detectors.

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Neptunium is a radioactive, mostly synthetic element; its data may be based on limited experiments or theoretical prediction.

Properties of Neptunium

Atomic number
93
Chemical symbol
Np
Atomic mass
237
Category
Actinide
Period
7
Block
f
Phase
Solid
Protons
93
Electrons
93
Neutrons (approx.)
144
Electron shells
2, 8, 18, 32, 22, 9, 2
Outer-shell electrons
2
Discovered
Edwin McMillan (1940)

Electron configuration of Neptunium

The electron configuration of Neptunium (Np), with 93 electrons, is shown below. The last shell (shell 7) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f⁴ 6s² 6p⁶ 6d¹ 7s²
Short configuration
[Rn] 5f⁴ 6d¹ 7s²
Last shell
7s²

What is electron configuration and how is it written?

Electron shells of Neptunium

Distribution of 93 electrons of Neptunium across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O22
  6. P9
  7. Q2

What is a actinide?

The actinides are the 15 elements from actinium to lawrencium, part of the f-block, and all of them are radioactive.

Uses of Neptunium

Frequently asked questions about Neptunium

What is the atomic number of Neptunium?

The atomic number of Neptunium (Np) is 93; that is, every atom of it has 93 protons.

What is the electron configuration of Neptunium?

The electron configuration of Neptunium (Np) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f⁴ 6s² 6p⁶ 6d¹ 7s²; in short form it is [Rn] 5f⁴ 6d¹ 7s², and its last shell is 7s².

What is the chemical symbol of Neptunium?

The chemical symbol of Neptunium is Np.

Where is Neptunium located in the periodic table?

Neptunium is located in period 7 and the f-block (Actinides) and belongs to the “Actinide” category.

What is the atomic mass of Neptunium?

The atomic mass of Neptunium is about 237 (atomic mass units).

What is the phase of Neptunium under normal conditions?

The phase of Neptunium under standard conditions is Solid.

What are the uses of Neptunium?

Uses of Neptunium include Scientific research and Neutron detectors.

Who discovered Neptunium?

Neptunium was discovered by Edwin McMillan in 1940.

Elements in the same category as Neptunium (Actinide)

Actinium (Ac)Thorium (Th)Protactinium (Pa)Uranium (U)Plutonium (Pu)Americium (Am)Curium (Cm)Berkelium (Bk)Californium (Cf)Einsteinium (Es)Fermium (Fm)Mendelevium (Md)Nobelium (No)Lawrencium (Lr)

See all Actinides