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Radium vs Neptunium

Radium
Neptunium
Neptunium vs Radium


Periodic Table
Symbol
Ra  
Np  
Group Number
2  
16
3  
15
Period Number
7  
7  
Block
s block  
f block  
Element Family
Alkaline Earth  
Actinide  
CAS Number
7440144  
99+
7439998  
99+
Space Group Name
Im_ 3m  
Pnma  
Space Group Number
229.00  
2
62.00  
14
Facts
Interesting Facts
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Neptunium was the first transuranium element to be discovered.  
Sources
Mining, Ores of metals  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
-  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1898  
In 1940  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
0.00 %  
26
0.00 %  
26
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
23
0.00 %  
24
Uses
Uses & Benefits
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
  • 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
-  
-  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
-  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
700.00 °C  
99+
640.00 °C  
99+
Boiling Point
1,737.00 °C  
99+
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
6.00  
6
Brinell Hardness
700.00 MPa  
17
622.00 MPa  
23
Vickers Hardness
140.00 MPa  
99+
640.00 MPa  
23
Speed of Sound
3,150.00 m/s  
37
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.30  
99+
Reflectivity
83.00 %  
6
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Np  
Isotopes
  
  
Known Isotopes
33  
6
20  
19
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
1.36  
30
Sanderson Electronegativity
0.89  
99+
1.36  
23
Allred Rochow Electronegativity
0.97  
39
1.22  
27
Mulliken-Jaffe Electronegativity
0.92  
99+
1.36  
31
Allen Electronegativity
0.89  
99+
1.36  
37
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
2.64  
25
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
979.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
509.30 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
5,093.00 kJ/mol  
27
3,242.00 kJ/mol  
99+
5th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
6th Energy Level
5,090.00 kJ/mol  
99+
5,785.00 kJ/mol  
99+
7th Energy level
5,090.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
8th Energy Level
5,090.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
10th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
11th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
12th Energy Level
5,090.00 kJ/mol  
99+
61,800.00 kJ/mol  
13
13th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
40
14th Energy Level
5,090.00 kJ/mol  
99+
6,180.00 kJ/mol  
29
15th Energy Level
50,900.00 kJ/mol  
99+
60,600.00 kJ/mol  
99+
16th Energy Level
50,900.00 kJ/mol  
99+
60,420.00 kJ/mol  
31
17th Energy Level
509.30 kJ/mol  
99+
604.00 kJ/mol  
99+
18th Energy Level
5,090.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
19th Energy Level
509.30 kJ/mol  
99+
604.50 kJ/mol  
99+
20th Energy Level
509.00 kJ/mol  
99+
604.00 kJ/mol  
99+
21st Energy Level
509.30 kJ/mol  
99+
6,040.00 kJ/mol  
17
22nd Energy Level
509.00 kJ/mol  
99+
604.00 kJ/mol  
40
23rd Energy Level
509.30 kJ/mol  
99+
6,040.00 kJ/mol  
18
24th Energy Level
509.30 kJ/mol  
99+
604.50 kJ/mol  
99+
25th Energy Level
509.00 kJ/mol  
99+
604.00 kJ/mol  
99+
26th Energy Level
509.30 kJ/mol  
99+
604.00 kJ/mol  
99+
27th Energy Level
509.30 kJ/mol  
99+
604.00 kJ/mol  
99+
28th Energy Level
509.30 kJ/mol  
99+
604.00 kJ/mol  
99+
29th Energy Level
509.30 kJ/mol  
99+
604.00 kJ/mol  
99+
30th Energy Level
509.00 kJ/mol  
99+
604.00 kJ/mol  
99+
Electrochemical Equivalent
4.22 g/amp-hr  
6
1.77 g/amp-hr  
99+
Electron Work Function
4.30 eV  
25
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
88  
30
93  
25
Electron Configuration
[Rn] 7s2  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Orthorhombic (ORTH)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
88  
30
93  
25
Number of Neutrons
138  
17
144  
15
Number of Electrons
88  
30
93  
25
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
155.00 pm  
32
Covalent Radius
221.00 pm  
3
190.00 pm  
18
Van der Waals Radius
283.00 pm  
5
221.00 pm  
27
Atomic Weight
226.00 amu  
26
237.00 amu  
22
Atomic Volume
45.20 cm3/mol  
5
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Uranium
  
Next Element
Actinium
  
Plutonium
  
Valence Electron Potential
20.10 (-eV)  
99+
96.00 (-eV)  
9
Lattice Constant
514.80 pm  
15
666.30 pm  
3
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
99+
1.43  
99+
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
19.38 g/cm3  
14
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
20.25 g/cm3  
10
Tensile Strength
40.00 MPa  
99+
125.00 MPa  
26
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
5.60 GPa  
99+
Bulk Modulus
43.00 GPa  
33
180.00 GPa  
9
Young's Modulus
83.00 GPa  
25
46.00 GPa  
99+
Poisson Ratio
0.31  
13
0.26  
22
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
20.25  
15
Magnetic Ordering
Nonmagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
6
Susceptibility
0.00  
18
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
100.00 nΩ·m  
31
1.22 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
0.90 kJ/mol  
99+
118.60 kJ/mol  
6
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
20.05 J/mol·K  
99+
29.46 J/mol·K  
10
Thermal Conductivity
18.60 W/m·K  
99+
6.30 W/m·K  
99+
Critical Temperature
973.00 K  
99+
913.00 K  
99+
Thermal Expansion
8.50 µm/(m·K)  
99+
13.30 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
336.00 kJ/mol  
39
Enthalpy of Fusion
8.60 kJ/mol  
99+
3.20 kJ/mol  
99+
Enthalpy of Atomization
163.00 kJ/mol  
99+
275.30 kJ/mol  
99+
Standard Molar Entropy
71.00 J/mol.K  
14
64.00 J/mol.K  
21
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