Radium vs Tantalum
Periodic Table
Symbol
Ra
Ta
Group Number
2
16
5
13
Period Number
7
6
Block
s block
d block
Element Family
Alkaline Earth
Transition Metal
CAS Number
7440144
99+
7440257
99+
Space Group Name
Im_ 3m
Im_ 3m
Space Group Number
229.00
1
229.00
1
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.
- Tantalum metal is known as corrosion resistance.
- Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
Sources
Mining, Ores of metals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Not Available
Anders Gustaf Ekeberg
Discovery
In 1898
In 1802
Abundance
Abundance In Universe
Not Available
8 * 10-9 %
31
Abundance In Meteorites
Not Available
0.00 %
99+
Abundance In Earth's Crust
0.00 %
99+
0.00 %
37
Abundance In Oceans
0.00 %
99+
0.00 %
31
Abundance In Humans
0.00 %
20
Not Available
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.
- Tantalum metal is mainly used in the manufacturing of electron components. Its Oxide layer acts as an insulator.
- Tantalum metal is also used in surgical transplant like replacement of bone, skull plates and as a woven gauze.
Industrial Uses
NA
Electrical Industry, Electronic Industry
Medical Uses
Pharmaceutical Industry
NA
Other Uses
NA
Alloys
Biological Properties
Toxicity
Highly Toxic
Low Toxic
Present in Human Body
No
Yes
In Bone
Not Available
0.03 p.p.m.
28
Physical Properties
Melting Point
700.00 °C
99+
2,996.00 °C
4
Boiling Point
1,737.00 °C
99+
5,425.00 °C
4
Appearance
Physical State
Solid
Solid
Color
Silvery White
Gray Blue
Luster
Metallic
Metallic
Hardness
Mohs Hardness
Not Available
6.50
5
Brinell Hardness
Not Available
440.00 MPa
28
Vickers Hardness
Not Available
870.00 MPa
12
Speed of Sound
Not Available
3,400.00 m/s
22
Optical Properties
Reflectivity
Not Available
78.00 %
6
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
Ra
Ta
Isotopes
Known Isotopes
33
6
31
8
Electronegativity
Pauling Electronegativity
0.90
99+
1.50
27
Allred Rochow Electronegativity
0.97
38
1.33
22
Mulliken-Jaffe Electronegativity
0.92
20
Not Available
Allen Electronegativity
0.89
99+
1.34
33
Electropositivity
Pauling Electropositivity
3.10
5
2.50
27
Ionization Energies
1st Energy Level
509.30 kJ/mol
99+
761.00 kJ/mol
18
2nd Energy Level
979.00 kJ/mol
99+
1,500.00 kJ/mol
40
Electrochemical Equivalent
4.22 g/amp-hr
6
1.35 g/amp-hr
99+
Electron Work Function
Not Available
4.25 eV
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
88
30
73
99+
Electron Configuration
[Rn] 7s2
[Xe] 4f14 5d3 6s2
Crystal Structure
Body Centered Cubic (BCC)
Body Centered Cubic (BCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
88
30
73
99+
Number of Neutrons
138
16
108
28
Number of Electrons
88
30
73
99+
Radius of an Atom
Atomic Radius
Not Available
146.00 pm
35
Covalent Radius
221.00 pm
3
170.00 pm
25
Van der Waals Radius
283.00 pm
4
200.00 pm
28
Atomic Weight
226.00 amu
26
180.95 amu
38
Atomic Volume
45.20 cm3/mol
4
10.90 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
20.10 (-eV)
99+
110.00 (-eV)
7
Lattice Constant
514.80 pm
13
330.13 pm
99+
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
5.50 g/cm3
99+
16.69 g/cm3
18
Density When Liquid (at m.p.)
Not Available
15.00 g/cm3
9
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
31
Elasticity properties
Shear Modulus
Not Available
69.00 GPa
13
Bulk Modulus
Not Available
200.00 GPa
8
Young's Modulus
Not Available
186.00 GPa
13
Poisson Ratio
Not Available
0.34
10
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
5.00
99+
16.65
11
Magnetic Ordering
Nonmagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
100.00 nΩ·m
31
131.00 nΩ·m
25
Electrical Conductivity
Not Available
0.08 106/cm Ω
27
Electron Affinity
Not Available
31.00 kJ/mol
29
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.14 J/(kg K)
37
Molar Heat Capacity
Not Available
25.36 J/mol·K
99+
Thermal Conductivity
18.60 W/m·K
99+
57.50 W/m·K
27
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
6.30 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
753.10 kJ/mol
2
Enthalpy of Fusion
Not Available
31.40 kJ/mol
3
Enthalpy of Atomization
163.00 kJ/mol
99+
782.00 kJ/mol
3
Standard Molar Entropy
71.00 J/mol.K
14
41.50 J/mol.K
37
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