Symbol
Ta
Cs
Group Number
51
0
17
👆🏻
Period Number
66
2
7
👆🏻
Block
d block
s block
Element Family
Transition Metal
Alkali
CAS Number
74402577440462
7429905
54386242
👆🏻
Space Group Name
Im_ 3m
Im_ 3m
Space Group Number
229.00229.00
11
276
👆🏻
Interesting Facts
- Tantalum metal is known as corrosion resistance.
- Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
Cesium is the most alkaline metal and is used in atomic clocks.
Sources
Found in Minerals, Mining, Ores of Minerals
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Anders Gustaf Ekeberg
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1802
In 1860
Abundance
Abundance In Universe
0.00 %0.00 %
0
0.11
👆🏻
Abundance In Sun
0.00 %0.00 %
0
0.1
👆🏻
Abundance In Meteorites
0.00 %0.00 %
0
22
👆🏻
Abundance In Earth's Crust
0.00 %0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
0.00 %0.00 %
0
1.1
👆🏻
Abundance In Humans
0.00 %0.00 %
0
1.4
👆🏻
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.
- The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
-
In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
Industrial Uses
Electrical Industry, Electronic Industry
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
-
-
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Low Toxic
Mildly Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
0.00 Blood/mg dm-30.00 Blood/mg dm-3
0
1970
👆🏻
In Bone
0.03 p.p.m.0.05 p.p.m.
0
170000
👆🏻
Melting Point
2,996.00 °C28.50 °C
-38.83
3410
👆🏻
Boiling Point
5,425.00 °C678.40 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
Gray Blue
Silvery Gold
Luster
Metallic
-
Hardness
Mohs Hardness
6.500.20
0.2
8.5
👆🏻
Brinell Hardness
440.00 MPa0.14 MPa
0.14
3490
👆🏻
Vickers Hardness
870.00 MPa0.14 MPa
0
3920
👆🏻
Speed of Sound
3,400.00 m/s1,630.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
2.151.93
0.155
3.41
👆🏻
Reflectivity
78.00 %35.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Ta
Cs
Isotopes
Known Isotopes
3136
0
38
👆🏻
Electronegativity
Pauling Electronegativity
1.500.79
0
2.6
👆🏻
Sanderson Electronegativity
1.500.22
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.330.86
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.500.62
0.62
2.48
👆🏻
Allen Electronegativity
1.340.66
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.503.21
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
761.00 kJ/mol375.70 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,500.00 kJ/mol2,234.30 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
761.00 kJ/mol3,400.00 kJ/mol
392.8
34230
👆🏻
4th Energy Level
7,610.00 kJ/mol375.70 kJ/mol
375.7
37066
👆🏻
5th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
392
97510
👆🏻
6th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
1007
105800
👆🏻
7th Energy level
7,610.00 kJ/mol3,750.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
7,610.00 kJ/mol3,760.00 kJ/mol
730
125300
👆🏻
9th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
7,610.00 kJ/mol3,757.00 kJ/mol
392
144300
👆🏻
11th Energy Level
7,610.00 kJ/mol3,757.00 kJ/mol
392
169988
👆🏻
12th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
0
189368
👆🏻
13th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
7,610.00 kJ/mol3,750.00 kJ/mol
380
86450
👆🏻
15th Energy Level
76,100.00 kJ/mol37,500.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
76,100.00 kJ/mol375.70 kJ/mol
375.7
109480
👆🏻
17th Energy Level
761.00 kJ/mol375.70 kJ/mol
375.7
122200
👆🏻
18th Energy Level
7,610.00 kJ/mol3,757.00 kJ/mol
0
134810
👆🏻
19th Energy Level
761.00 kJ/mol375.70 kJ/mol
375.7
148700
👆🏻
20th Energy Level
761.00 kJ/mol375.00 kJ/mol
0
171200
👆🏻
21st Energy Level
761.00 kJ/mol375.70 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
761.00 kJ/mol375.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
761.00 kJ/mol375.70 kJ/mol
357.6
198800
👆🏻
24th Energy Level
761.00 kJ/mol375.70 kJ/mol
297.3
195200
👆🏻
25th Energy Level
761.00 kJ/mol375.70 kJ/mol
0
121900
👆🏻
26th Energy Level
761.00 kJ/mol375.70 kJ/mol
357.6
127700
👆🏻
27th Energy Level
761.00 kJ/mol375.70 kJ/mol
0
133800
👆🏻
28th Energy Level
761.00 kJ/mol375.70 kJ/mol
297.3
139800
👆🏻
29th Energy Level
761.00 kJ/mol375.70 kJ/mol
0
148100
👆🏻
30th Energy Level
761.00 kJ/mol375.70 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
1.35 g/amp-hr4.96 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
4.25 eV2.14 eV
2.14
6
👆🏻
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Number
7355
3
117
👆🏻
Electron Configuration
[Xe] 4f14 5d3 6s2
[Xe] 6s1
Crystal Structure
Body Centered Cubic (BCC)
Body Centered Cubic (BCC)
Crystal Lattice
Atom
Number of Protons
7355
3
117
👆🏻
Number of Neutrons
10878
4
285
👆🏻
Number of Electrons
7355
3
117
👆🏻
Radius of an Atom
Atomic Radius
146.00 pm265.00 pm
0
348
👆🏻
Covalent Radius
170.00 pm244.00 pm
0
260
👆🏻
Van der Waals Radius
200.00 pm343.00 pm
0
348
👆🏻
Atomic Weight
180.95 amu132.91 amu
6.94
294
👆🏻
Atomic Volume
10.90 cm3/mol71.07 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
110.00 (-eV)8.62 (-eV)
0
392.42
👆🏻
Lattice Constant
330.13 pm614.10 pm
0
891.25
👆🏻
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
1.411.87
0.423
1.9
👆🏻
Density
Density At Room Temperature
16.69 g/cm31.93 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
15.00 g/cm31.84 g/cm3
0.512
41
👆🏻
Tensile Strength
180.00 MPa15.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)0.00 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)0.00 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
69.00 GPa30.00 GPa
1.3
222
👆🏻
Bulk Modulus
200.00 GPa1.60 GPa
0
462
👆🏻
Young's Modulus
186.00 GPa1.70 GPa
0
528
👆🏻
Poisson Ratio
0.340.35
0.032
0.47
👆🏻
Other Mechanical Properties
Ductile
Ductile
Magnetic Characteristics
Specific Gravity
16.651.87
0.53
4500
👆🏻
Magnetic Ordering
Paramagnetic
Paramagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
Conductor
Semiconductor
Resistivity
131.00 nΩ·m205.00 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.08 106/cm Ω0.05 106/cm Ω
0
0.63
👆🏻
Electron Affinity
31.00 kJ/mol45.50 kJ/mol
0
222.8
👆🏻
Specific Heat
0.14 J/(kg K)0.24 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
25.36 J/mol·K32.21 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
57.50 W/m·K35.90 W/m·K
0
429
👆🏻
Critical Temperature
3,290.00 K1,938.00 K
26.3
3695
👆🏻
Thermal Expansion
6.30 µm/(m·K)97.00 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
753.10 kJ/mol65.90 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
31.40 kJ/mol2.10 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
782.00 kJ/mol78.20 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
41.50 J/mol.K85.20 J/mol.K
9.5
198.1
👆🏻