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Zirconium vs Neptunium

Zirconium
Neptunium
Neptunium vs Zirconium


Periodic Table
Symbol
Zr  
Np  
Group Number
4  
14
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440677  
23
7439998  
99+
Space Group Name
P63/mmc  
Pnma  
Space Group Number
194.00  
7
62.00  
14
Facts
Interesting Facts
  • Zirconium metal can resist to weak acids.
  • Zirconium metal reacts with oxygen and nitrogen in the atmosphere.
  
Neptunium was the first transuranium element to be discovered.  
Sources
Found in Minerals, Mining, Ores of Minerals  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Martin Heinrich Klaproth  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1789  
In 1940  
Abundance
  
  
Abundance In Universe
0.00 %  
14
0.00 %  
40
Abundance In Sun
0.00 %  
16
0.00 %  
26
Abundance In Meteorites
0.00 %  
17
0.00 %  
99+
Abundance In Earth's Crust
0.01 %  
14
0.00 %  
99+
Abundance In Oceans
0.00 %  
23
-  
Abundance In Humans
0.00 %  
18
0.00 %  
24
Uses
Uses & Benefits
  • As this metal does not absorb neutrons; It is used in nuclear power stations.
  • Its oxide is used in ultra strong ceramics. It is also used in manufacturing Crucibles.
  
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
Industrial Uses
Aerospace Industry, Ammunition Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
Yes  
No  
In Blood
0.01 Blood/mg dm-3  
21
0.00 Blood/mg dm-3  
40
In Bone
0.10 p.p.m.  
28
0.00 p.p.m.  
99+
Physical
Melting Point
1,852.00 °C  
15
640.00 °C  
99+
Boiling Point
4,377.00 °C  
11
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
5.00  
8
6.00  
6
Brinell Hardness
638.00 MPa  
21
622.00 MPa  
23
Vickers Hardness
820.00 MPa  
22
640.00 MPa  
23
Speed of Sound
3,800.00 m/s  
27
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.15  
10
1.30  
99+
Reflectivity
70.00 %  
13
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Zr  
Np  
Isotopes
  
  
Known Isotopes
24  
15
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.33  
31
1.36  
30
Sanderson Electronegativity
0.90  
99+
1.36  
23
Allred Rochow Electronegativity
1.22  
27
1.22  
27
Mulliken-Jaffe Electronegativity
1.33  
32
1.36  
31
Allen Electronegativity
1.32  
39
1.36  
37
Electropositivity
  
  
Pauling Electropositivity
2.67  
24
2.64  
25
Ionization Energies
  
  
1st Energy Level
640.10 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
1,270.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
2,218.00 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
3,313.00 kJ/mol  
99+
3,242.00 kJ/mol  
99+
5th Energy Level
7,752.00 kJ/mol  
16
6,180.00 kJ/mol  
99+
6th Energy Level
9,500.00 kJ/mol  
21
5,785.00 kJ/mol  
99+
7th Energy level
6,400.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
8th Energy Level
6,400.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
9th Energy Level
6,400.00 kJ/mol  
40
6,180.00 kJ/mol  
99+
10th Energy Level
5,730.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
11th Energy Level
6,406.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
12th Energy Level
6,400.00 kJ/mol  
99+
61,800.00 kJ/mol  
13
13th Energy Level
6,400.00 kJ/mol  
36
6,180.00 kJ/mol  
40
14th Energy Level
640.00 kJ/mol  
99+
6,180.00 kJ/mol  
29
15th Energy Level
64,000.00 kJ/mol  
36
60,600.00 kJ/mol  
99+
16th Energy Level
64,000.00 kJ/mol  
27
60,420.00 kJ/mol  
31
17th Energy Level
640.10 kJ/mol  
99+
604.00 kJ/mol  
99+
18th Energy Level
6,400.00 kJ/mol  
38
6,040.00 kJ/mol  
99+
19th Energy Level
640.00 kJ/mol  
99+
604.50 kJ/mol  
99+
20th Energy Level
640.00 kJ/mol  
39
604.00 kJ/mol  
99+
21st Energy Level
640.10 kJ/mol  
99+
6,040.00 kJ/mol  
17
22nd Energy Level
640.00 kJ/mol  
33
604.00 kJ/mol  
40
23rd Energy Level
640.10 kJ/mol  
99+
6,040.00 kJ/mol  
18
24th Energy Level
640.00 kJ/mol  
35
604.50 kJ/mol  
99+
25th Energy Level
640.10 kJ/mol  
37
604.00 kJ/mol  
99+
26th Energy Level
640.10 kJ/mol  
36
604.00 kJ/mol  
99+
27th Energy Level
640.10 kJ/mol  
38
604.00 kJ/mol  
99+
28th Energy Level
640.10 kJ/mol  
99+
604.00 kJ/mol  
99+
29th Energy Level
640.10 kJ/mol  
99+
604.00 kJ/mol  
99+
30th Energy Level
640.10 kJ/mol  
39
604.00 kJ/mol  
99+
Electrochemical Equivalent
0.85 g/amp-hr  
99+
1.77 g/amp-hr  
99+
Electron Work Function
4.05 eV  
34
4.90 eV  
12
Other Chemical Properties
Anti Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
40  
99+
93  
25
Electron Configuration
[Kr] 4d2 5s2  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Orthorhombic (ORTH)  
Crystal Lattice
HCP-Crystal-Structure-of-Zirconium.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
40  
99+
93  
25
Number of Neutrons
51  
99+
144  
15
Number of Electrons
40  
99+
93  
25
Radius of an Atom
  
  
Atomic Radius
160.00 pm  
29
155.00 pm  
32
Covalent Radius
175.00 pm  
25
190.00 pm  
18
Van der Waals Radius
200.00 pm  
35
221.00 pm  
27
Atomic Weight
91.22 amu  
99+
237.00 amu  
22
Atomic Volume
14.10 cm3/mol  
99+
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Yttrium
  
Uranium
  
Next Element
Niobium
  
Plutonium
  
Valence Electron Potential
80.00 (-eV)  
18
96.00 (-eV)  
9
Lattice Constant
323.20 pm  
99+
666.30 pm  
3
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.59  
25
1.43  
99+
Mechanical
Density
  
  
Density At Room Temperature
6.52 g/cm3  
99+
19.38 g/cm3  
14
Density When Liquid (at m.p.)
5.80 g/cm3  
99+
20.25 g/cm3  
10
Tensile Strength
330.00 MPa  
14
125.00 MPa  
26
Viscosity
0.00  
12
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
21
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
33.00 GPa  
23
5.60 GPa  
99+
Bulk Modulus
91.10 GPa  
18
180.00 GPa  
9
Young's Modulus
88.00 GPa  
24
46.00 GPa  
99+
Poisson Ratio
0.34  
10
0.26  
22
Other Mechanical Properties
Ductile, Malleable  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.51  
99+
20.25  
15
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
6
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
421.00 nΩ·m  
11
1.22 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
41.10 kJ/mol  
32
118.60 kJ/mol  
6
Thermal
Specific Heat
0.27 J/(kg K)  
19
0.12 J/(kg K)  
99+
Molar Heat Capacity
25.36 J/mol·K  
99+
29.46 J/mol·K  
10
Thermal Conductivity
22.60 W/m·K  
99+
6.30 W/m·K  
99+
Critical Temperature
2,128.00 K  
17
913.00 K  
99+
Thermal Expansion
5.70 µm/(m·K)  
99+
13.30 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
581.60 kJ/mol  
11
336.00 kJ/mol  
39
Enthalpy of Fusion
20.90 kJ/mol  
11
3.20 kJ/mol  
99+
Enthalpy of Atomization
598.00 kJ/mol  
12
275.30 kJ/mol  
99+
Standard Molar Entropy
39.00 J/mol.K  
99+
64.00 J/mol.K  
21
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