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Terbium vs Potassium

Terbium
Potassium
Potassium vs Terbium


Periodic Table
Symbol
Tb  
K  
Group Number
3  
15
1  
17
Period Number
6  
4  
Block
f block  
s block  
Element Family
Lanthanide  
Alkali  
CAS Number
7440279  
99+
7440097  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • At times Terbium metal acts same as Calcium.
  • Terbium metal closely similar to Lanthanum metal.
  
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  
Sources
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals  
Found in Minerals, Mining  
History
  
  
Who Discovered
Carl Gustaf Mosander  
Humphry Davy  
Discovery
In 1842  
In 1807  
Abundance
  
  
Abundance In Universe
0.00 %  
28
0.00 %  
10
Abundance In Sun
0.00 %  
29
0.00 %  
9
Abundance In Meteorites
0.00 %  
99+
0.07 %  
9
Abundance In Earth's Crust
0.00 %  
40
1.50 %  
6
Abundance In Oceans
0.00 %  
99+
0.04 %  
3
Abundance In Humans
0.00 %  
24
0.20 %  
3
Uses
Uses & Benefits
  • Terbium salts are used in optical devices like laser devices.
  • Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
  
  • Potassium’s compounds are in high demand for their application in Fertilizer manufacturing.
  • Potassium carbonate is used in glass manufacturing and Potassium carbonate in manufacturing detergent and body wash.
  
Industrial Uses
Electronic Industry  
Ammunition Industry, Chemical Industry  
Medical Uses
-  
Pharmaceutical Industry  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Low Toxic  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
1,620.00 Blood/mg dm-3  
2
In Bone
0.00 p.p.m.  
99+
2,100.00 p.p.m.  
3
Physical
Melting Point
1,356.00 °C  
33
63.65 °C  
99+
Boiling Point
3,123.00 °C  
30
774.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Gray  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
1.50  
19
0.40  
25
Brinell Hardness
677.00 MPa  
19
0.36 MPa  
99+
Vickers Hardness
863.00 MPa  
20
100.00 MPa  
99+
Speed of Sound
2,620.00 m/s  
99+
2,000.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
32
1.33  
99+
Reflectivity
35.00 %  
34
72.00 %  
11
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tb  
K  
Isotopes
  
  
Known Isotopes
26  
13
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
0.82  
99+
Sanderson Electronegativity
1.20  
32
0.45  
99+
Allred Rochow Electronegativity
1.10  
31
0.91  
40
Mulliken-Jaffe Electronegativity
1.20  
39
0.73  
99+
Allen Electronegativity
1.20  
99+
0.73  
99+
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
3.18  
3
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol  
99+
418.80 kJ/mol  
99+
2nd Energy Level
1,174.80 kJ/mol  
99+
3,052.00 kJ/mol  
5
3rd Energy Level
2,417.00 kJ/mol  
99+
4,420.00 kJ/mol  
8
4th Energy Level
4,203.00 kJ/mol  
99+
5,877.00 kJ/mol  
18
5th Energy Level
5,658.00 kJ/mol  
99+
7,975.00 kJ/mol  
14
6th Energy Level
5,658.00 kJ/mol  
99+
9,590.00 kJ/mol  
19
7th Energy level
5,420.00 kJ/mol  
99+
11,343.00 kJ/mol  
17
8th Energy Level
5,650.00 kJ/mol  
99+
14,944.00 kJ/mol  
13
9th Energy Level
5,650.00 kJ/mol  
99+
16,963.70 kJ/mol  
15
10th Energy Level
5,650.00 kJ/mol  
99+
48,610.00 kJ/mol  
3
11th Energy Level
5,650.00 kJ/mol  
99+
54,490.00 kJ/mol  
4
12th Energy Level
5,650.00 kJ/mol  
99+
60,730.00 kJ/mol  
15
13th Energy Level
5,650.00 kJ/mol  
99+
68,950.00 kJ/mol  
4
14th Energy Level
5,650.00 kJ/mol  
99+
75,900.00 kJ/mol  
5
15th Energy Level
56,500.00 kJ/mol  
99+
83,080.00 kJ/mol  
13
16th Energy Level
56,500.00 kJ/mol  
99+
93,400.00 kJ/mol  
7
17th Energy Level
565.80 kJ/mol  
99+
99,710.00 kJ/mol  
8
18th Energy Level
5,658.00 kJ/mol  
99+
4,196.00 kJ/mol  
99+
19th Energy Level
565.00 kJ/mol  
99+
419.20 kJ/mol  
99+
20th Energy Level
565.00 kJ/mol  
99+
419.00 kJ/mol  
99+
21st Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
22nd Energy Level
565.00 kJ/mol  
99+
419.00 kJ/mol  
99+
23rd Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
24th Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
25th Energy Level
565.00 kJ/mol  
99+
419.20 kJ/mol  
99+
26th Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
27th Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
28th Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
29th Energy Level
565.80 kJ/mol  
99+
419.20 kJ/mol  
99+
30th Energy Level
565.00 kJ/mol  
99+
419.00 kJ/mol  
99+
Electrochemical Equivalent
1.98 g/amp-hr  
35
1.46 g/amp-hr  
99+
Electron Work Function
3.00 eV  
99+
2.30 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Flammability, Ionization, Solubility  
Atomic
Atomic Number
65  
99+
19  
99+
Electron Configuration
[Xe] 4f9 6s2  
[Ar] 4s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
65  
99+
19  
99+
Number of Neutrons
94  
37
20  
99+
Number of Electrons
65  
99+
19  
99+
Radius of an Atom
  
  
Atomic Radius
177.00 pm  
19
227.00 pm  
4
Covalent Radius
194.00 pm  
16
203.00 pm  
9
Van der Waals Radius
221.00 pm  
27
275.00 pm  
7
Atomic Weight
158.93 amu  
99+
39.10 amu  
99+
Atomic Volume
19.20 cm3/mol  
34
45.46 cm3/mol  
4
Adjacent Atomic Numbers
  
  
Previous Element
Gadolinium
  
Aluminium
  
Next Element
Dysprosium
  
Calcium
  
Valence Electron Potential
46.80 (-eV)  
34
10.40 (-eV)  
99+
Lattice Constant
360.10 pm  
40
532.80 pm  
13
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
35
1.69  
10
Mechanical
Density
  
  
Density At Room Temperature
8.23 g/cm3  
99+
0.86 g/cm3  
99+
Density When Liquid (at m.p.)
7.65 g/cm3  
99+
0.83 g/cm3  
99+
Tensile Strength
60.00 MPa  
35
16.00 MPa  
99+
Viscosity
0.00  
25
0.00  
9
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
31
0.00 (Pa)  
16
Vapor Pressure at 2000 K
12.50 (Pa)  
8
0.00 (Pa)  
34
Elasticity properties
  
  
Shear Modulus
22.10 GPa  
99+
1.30 GPa  
99+
Bulk Modulus
38.70 GPa  
40
3.10 GPa  
99+
Young's Modulus
55.70 GPa  
37
3.53 GPa  
99+
Poisson Ratio
0.26  
21
0.35  
9
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.23  
99+
0.86  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
13
Susceptibility
0.00  
24
0.00  
23
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.15 nΩ·m  
99+
72.00 nΩ·m  
37
Electrical Conductivity
0.01 106/cm Ω  
99+
0.14 106/cm Ω  
16
Electron Affinity
50.00 kJ/mol  
26
48.40 kJ/mol  
27
Thermal
Specific Heat
0.18 J/(kg K)  
34
0.75 J/(kg K)  
6
Molar Heat Capacity
28.91 J/mol·K  
12
29.60 J/mol·K  
8
Thermal Conductivity
11.10 W/m·K  
99+
102.50 W/m·K  
15
Critical Temperature
1,629.00 K  
37
2,223.00 K  
14
Thermal Expansion
10.30 µm/(m·K)  
99+
83.30 µm/(m·K)  
3
Enthalpy
  
  
Enthalpy of Vaporization
330.90 kJ/mol  
99+
77.50 kJ/mol  
99+
Enthalpy of Fusion
10.80 kJ/mol  
40
2.32 kJ/mol  
99+
Enthalpy of Atomization
314.00 kJ/mol  
99+
89.50 kJ/mol  
99+
Standard Molar Entropy
73.20 J/mol.K  
10
64.70 J/mol.K  
19
Periodic Table >>
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