Elements
93

Np

Neptunium

Neptunium (Np) is a silvery colored radioactive metal that has the atomic number 93 in the periodic table. It is an Actinoid Metal with the symbol Np.

Neptunium is a synthetic element of the actinides that was produced in 1940 by Edwin McMillan and Philip Abelson. Through bombarding Uranium atoms with neutrons they chemically produced an isotope of Neptunium-239. the element is named after the planet Neptune due to its proximity to uranium which is named after uranus. Much like other actinides it is radioactive and dangerous for handling. It is used to detect neutrons and also in the generation of electricity on spacecrafts. It is a solid metal at room temperature and it has a melting point of 639°c and a boiling point of 4147°c.

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FAQ's

What is the Melting Point for Neptunium?

Neptunium has a Melting Point of 640°F, meaning at 640°F it will turn to a liquid.

What is the Boiling Point for Neptunium?

Neptunium has a Boiling Point of 3902°F, meaning at 3902°F it will turn to a Gas.

What is the Electronegativity of Neptunium?

Neptunium's Electronegativty is 1.36. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Neptunium?

Neptunium has a Heat of Vaporization of kJ/mol.

Uses

It has no significant commercial applications.

Sources

Produced by bombarding uranium with slow neutrons.

93
Protons
93
Electrons
144
Neutrons

Np

Element Symbol
Np
Atomic Weight
237
Atomic Number
93
State
Solid
Melting Point
Unknown
640
°C
Boiling Point
3902
Unknown
°C
Heat of Vaporization
Unknown
kJ/mol
Crystal Structure
Orthorhombic
Thermoconductivity
0.063
Unknown
W/cmK
Shells
2,8,18,32,22,9,2
Group
Actinide
Period
7
Block
F Block
Orbitals
[Rn] 5f4 6d1 7s2
Coefficient of Thermal Expansion
28 10^-6 K^-1
Covalent Radius
--
Density at 293K
20.45 g/cm³
Electrical Conductivity
0.00822 10^6/cm ohm
First Ionization Potential
6.2657 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
--
Oxydation States
6,(5),4,3
Lattice Parameter
6.663 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

nep-TOO-ni-em

Discovered by

E.M. McMillan, P.H. Abelson

Discovery date

1940

Orbital configuration
2,8,18,32,22,9,2

Download the Periodic Table

Explore Other Actinides

247
97

Bk

Berkelium
257
100

Fm

Fermium
252
99

Es

Einsteinium
231.036
91

Pa

Protactinium
227
89

Ac

Actinium
232.038
90

Th

Thorium
258
101

Md

Mendelevium
244
94

Pu

Plutonium
247
96

Cm

Curium
243
95

Am

Americium
251
98

Cf

Californium
238.029
92

U

Uranium
262
103

Lr

Lawrencium
259
102

No

Nobelium
The actinide series contains 15 metallic elements from number 89 (actinium) to 103 (lawrencium). They are located in group 3 in the periodic table.
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