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Tantalum vs Holmium

Tantalum
Holmium
Holmium vs Tantalum


Periodic Table
Symbol
Ta   
Ho   
Group Number
5   
13
Not Available   
Period Number
6   
6   
Block
d block   
f block   
Element Family
Transition Metal   
Lanthanide   
CAS Number
7440257   
99+
7440600   
29
Space Group Name
Im_ 3m   
P63/mmc   
Space Group Number
229.00   
1
194.00   
5
Facts
Interesting Facts
  • Tantalum metal is known as corrosion resistance.
  • Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Anders Gustaf Ekeberg   
Marc Delafontaine   
Discovery
In 1802   
In 1878   
Abundance
  
  
Abundance In Universe
8 * 10-9 %   
31
5 * 10-8 %   
27
Abundance In Meteorites
0.00 %   
99+
0.00 %   
99+
Abundance In Earth's Crust
0.00 %   
37
0.00 %   
38
Abundance In Oceans
0.00 %   
31
0.00 %   
99+
Uses
Uses & Benefits
  • 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.
  
  • Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
  • Alloys of Holmium are used to produce Magnet.
  
Industrial Uses
Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys, Nuclear Research   
Biological Properties
  
  
Toxicity
Low Toxic   
Low Toxic   
Present in Human Body
Yes   
No   
In Bone
0.03 p.p.m.   
28
Not Available   
Physical Properties
Melting Point
2,996.00 °C   
4
1,461.00 °C   
30
Boiling Point
5,425.00 °C   
4
2,600.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray Blue   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.50   
5
Not Available   
Brinell Hardness
440.00 MPa   
28
746.00 MPa   
13
Vickers Hardness
870.00 MPa   
12
481.00 MPa   
23
Speed of Sound
3,400.00 m/s   
22
2,760.00 m/s   
30
Optical Properties
  
  
Reflectivity
78.00 %   
6
Not Available   
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
Ta   
Ho   
Isotopes
  
  
Known Isotopes
31   
8
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.23   
37
Allred Rochow Electronegativity
1.33   
22
1.10   
30
Allen Electronegativity
1.34   
33
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.77   
17
Ionization Energies
  
  
1st Energy Level
761.00 kJ/mol   
18
581.00 kJ/mol   
99+
2nd Energy Level
1,500.00 kJ/mol   
40
1,140.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,204.00 kJ/mol   
99+
4th Energy Level
Not Available   
4,100.00 kJ/mol   
34
Electrochemical Equivalent
1.35 g/amp-hr   
99+
2.02 g/amp-hr   
29
Electron Work Function
4.25 eV   
21
Not Available   
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
73   
99+
67   
99+
Electron Configuration
[Xe] 4f14 5d3 6s2   
[Xe] 4f11 6s2   
Crystal Structure
Body Centered Cubic (BCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
HCP-Crystal-Structure-of-Holmium.jpg#100   
Atom
  
  
Number of Protons
73   
99+
67   
99+
Number of Neutrons
108   
28
98   
34
Number of Electrons
73   
99+
67   
99+
Radius of an Atom
  
  
Atomic Radius
146.00 pm   
35
176.00 pm   
18
Covalent Radius
170.00 pm   
25
192.00 pm   
17
Van der Waals Radius
200.00 pm   
28
216.00 pm   
24
Atomic Weight
180.95 amu   
38
164.93 amu   
99+
Atomic Volume
10.90 cm3/mol   
99+
18.70 cm3/mol   
24
Adjacent Atomic Numbers
  
  
Previous Element
Hafnium
  
Dysprosium
  
Next Element
Tungsten
  
Erbium
  
Valence Electron Potential
110.00 (-eV)   
7
47.90 (-eV)   
31
Lattice Constant
330.13 pm   
99+
357.73 pm   
38
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.57   
17
Mechanical Properties
Density
  
  
Density At Room Temperature
16.69 g/cm3   
18
8.79 g/cm3   
99+
Density When Liquid (at m.p.)
15.00 g/cm3   
9
8.34 g/cm3   
26
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
16
Vapor Pressure at 2000 K
0.00 (Pa)   
31
Not Available   
Elasticity properties
  
  
Shear Modulus
69.00 GPa   
13
26.30 GPa   
28
Bulk Modulus
200.00 GPa   
8
40.20 GPa   
32
Young's Modulus
186.00 GPa   
13
64.80 GPa   
31
Poisson Ratio
0.34   
10
0.23   
29
Other Mechanical Properties
Ductile   
Ductile, Malleable, Sectile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
16.65   
11
8.80   
35
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
131.00 nΩ·m   
25
814.00 nΩ·m   
4
Electrical Conductivity
0.08 106/cm Ω   
27
0.01 106/cm Ω   
99+
Electron Affinity
31.00 kJ/mol   
29
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.14 J/(kg K)   
37
0.16 J/(kg K)   
35
Molar Heat Capacity
25.36 J/mol·K   
99+
27.15 J/mol·K   
19
Thermal Conductivity
57.50 W/m·K   
27
16.20 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
6.30 µm/(m·K)   
99+
11.20 µm/(m·K)   
35
Enthalpy
  
  
Enthalpy of Vaporization
753.10 kJ/mol   
2
241.00 kJ/mol   
38
Enthalpy of Fusion
31.40 kJ/mol   
3
11.76 kJ/mol   
29
Enthalpy of Atomization
782.00 kJ/mol   
3
301.00 kJ/mol   
36
Standard Molar Entropy
41.50 J/mol.K   
37
75.30 J/mol.K   
8
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