Home

Transition Metals + -

Actinide Metals + -

Lanthanide Metals + -

Post-Transition Metals + -

Alkaline Earth Metals + -

Compare Metals


Neptunium vs Sodium


Sodium vs Neptunium


Periodic Table

Symbol
Np   
Na   

Group Number
Not Available   
1   
17

Period Number
7   
3   

Block
f block   
s block   

Element Family
Actinide   
Alkali   

CAS Number
7439998   
99+
7440235   
99+

Space Group Name
Pnma   
Im_ 3m   

Space Group Number
62.00   
11
229.00   
1

Facts

Interesting Facts
Not Available   
  • At room temperature Sodium metal is very soft as it can be chopped down into pieces with butter knife.
  • The most common compound of Sodium is NaCl (Salt).
  

Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
By Electrolysis Process, Mining   

History
  
  

Who Discovered
Edwin McMillan and Philip H. Abelson   
Humphry Davy   

Discovery
In 1940   
In 1807   

Abundance
  
  

Abundance In Universe
Not Available   
2 * 10-3 %   
6

Abundance In Sun
~-9999 %   
~0.004 %   
6

Abundance In Meteorites
Not Available   
0.55 %   
6

Abundance In Earth's Crust
Not Available   
2.30 %   
5

Abundance In Oceans
Not Available   
1.10 %   
1

Abundance In Humans
Not Available   
0.14 %   
3

Uses

Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • In some nuclear reactors sodium is used as a heat exchanger.
  • Compound of Sodium metals called Salt (Sodium chloride) is used in Food.
  

Industrial Uses
NA   
Electrical Industry, Electronic Industry   

Medical Uses
NA   
Pharmaceutical Industry   

Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   

Biological Properties
  
  

Toxicity
Toxic   
Toxic   

Present in Human Body
No   
Yes   

In Blood
0.00 Blood/mg dm-3   
37
1,970.00 Blood/mg dm-3   
1

In Bone
0.00 p.p.m.   
36
10,000.00 p.p.m.   
2

Physical Properties

Melting Point
640.00 °C   
99+
97.72 °C   
99+

Boiling Point
3,902.00 °C   
13
883.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silver   
Silvery White   

Luster
Metallic   
Metallic   

Hardness
  
  

Mohs Hardness
Not Available   
0.50   
22

Brinell Hardness
Not Available   
0.69 MPa   
99+

Speed of Sound
Not Available   
3,200.00 m/s   
24

Optical Properties
  
  

Allotropes
No   
No   

α Allotropes
Not Available   
Not Available   

β Allotropes
Not Available   
Not Available   

γ Allotropes
Not Available   
Not Available   

Chemical Properties

Chemical Formula
Np   
Na   

Isotopes
  
  

Known Isotopes
20   
19
17   
22

Electronegativity
  
  

Pauling Electronegativity
1.36   
29
0.93   
99+

Sanderson Electronegativity
Not Available   
0.56   
30

Allred Rochow Electronegativity
1.22   
26
1.01   
35

Mulliken-Jaffe Electronegativity
Not Available   
0.91   
21

Allen Electronegativity
Not Available   
0.87   
99+

Electropositivity
  
  

Pauling Electropositivity
2.64   
25
3.07   
6

Ionization Energies
  
  

1st Energy Level
604.50 kJ/mol   
99+
495.80 kJ/mol   
99+

2nd Energy Level
1,128.00 kJ/mol   
99+
4,562.00 kJ/mol   
4

3rd Energy Level
1,997.00 kJ/mol   
99+
6,910.30 kJ/mol   
6

4th Energy Level
3,242.00 kJ/mol   
99+
9,543.00 kJ/mol   
5

5th Energy Level
Not Available   
13,354.00 kJ/mol   
4

6th Energy Level
Not Available   
16,613.00 kJ/mol   
4

7th Energy level
Not Available   
20,117.00 kJ/mol   
4

8th Energy Level
Not Available   
25,496.00 kJ/mol   
4

9th Energy Level
Not Available   
28,932.00 kJ/mol   
4

10th Energy Level
Not Available   
141,362.00 kJ/mol   
2

11th Energy Level
Not Available   
159,076.00 kJ/mol   
2

Electrochemical Equivalent
1.77 g/amp-hr   
39
0.86 g/amp-hr   
99+

Electron Work Function
Not Available   
2.75 eV   
40

Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Chemical Stability, Corrosion, Flammability, Ionization, Solubility   

Atomic Properties

Atomic Number
93   
25
11   
99+

Electron Configuration
[Rn] 5f4 6d1 7s2   
[Ne] 3s1   

Crystal Structure
Orthorhombic (ORTH)   
Body Centered Cubic (BCC)   

Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
93   
25
11   
99+

Number of Neutrons
144   
14
12   
99+

Number of Electrons
93   
25
11   
99+

Radius of an Atom
  
  

Atomic Radius
155.00 pm   
30
186.00 pm   
9

Covalent Radius
190.00 pm   
18
166.00 pm   
27

Van der Waals Radius
221.00 pm   
22
227.00 pm   
21

Atomic Weight
237.00 amu   
22
22.99 amu   
99+

Atomic Volume
11.62 cm3/mol   
99+
23.70 cm3/mol   
10

Adjacent Atomic Numbers
  
  

Previous Element
Uranium
  
Beryllium
  

Next Element
Plutonium
  
Magnesium
  

Valence Electron Potential
96.00 (-eV)   
9
14.10 (-eV)   
99+

Lattice Constant
666.30 pm   
3
429.06 pm   
19

Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
19.38 g/cm3   
14
0.97 g/cm3   
99+

Density When Liquid (at m.p.)
Not Available   
0.93 g/cm3   
99+

Tensile Strength
125.00 MPa   
14
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   

Elasticity properties
  
  

Shear Modulus
Not Available   
3.30 GPa   
99+

Bulk Modulus
Not Available   
6.30 GPa   
99+

Young's Modulus
Not Available   
10.00 GPa   
99+

Poisson Ratio
Not Available   
Not Available   

Other Mechanical Properties
Ductile   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
20.25   
6
0.97   
99+

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Conductor   

Resistivity
1.22 nΩ·m   
99+
47.70 nΩ·m   
99+

Electrical Conductivity
0.01 106/cm Ω   
99+
0.21 106/cm Ω   
9

Electron Affinity
Not Available   
52.80 kJ/mol   
19

Thermal Properties

Specific Heat
0.12 J/(kg K)   
40
1.23 J/(kg K)   
3

Molar Heat Capacity
29.46 J/mol·K   
8
28.23 J/mol·K   
10

Thermal Conductivity
6.30 W/m·K   
99+
142.00 W/m·K   
11

Critical Temperature
Not Available   
2,573.00 K   
2

Thermal Expansion
Not Available   
71.00 µm/(m·K)   
4

Enthalpy
  
  

Enthalpy of Vaporization
Not Available   
89.04 kJ/mol   
99+

Enthalpy of Fusion
3.20 kJ/mol   
99+
2.59 kJ/mol   
99+

Enthalpy of Atomization
Not Available   
108.40 kJ/mol   
99+

Standard Molar Entropy
Not Available   
51.30 J/mol.K   
28

Periodic Table >>
<< All

Compare Actinide Series

Actinide Metals

Actinide Metals

» More Actinide Metals

Compare Actinide Series

» More Compare Actinide Series