×

Potassium
Potassium

Lanthanum
Lanthanum



ADD
Compare
X
Potassium
X
Lanthanum

Potassium Lanthanum Comparison

1 Periodic Table
1.1 Symbol
K
La
1.2 Group Number
1NA
Gadolinium Metal
0 17
1.3 Period Number
46
Lithium Metal
2 7
1.4 Block
s block
f block
1.5 Element Family
Alkali
Lanthanide
1.6 CAS Number
74400977439910
Aluminium Metal
7429905 54386242
1.7 Space Group Name
Im_ 3m
P63/mmc
1.8 Space Group Number
229.00194.00
Plutonium Metal
11 229
2 Facts
2.1 Interesting Facts
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
2.2 Sources
Found in Minerals, Mining
Found in Minerals, Mining, Ores of Minerals
2.3 History
2.3.1 Who Discovered
Humphry Davy
Carl Gustaf Mosander
2.3.2 Discovery
In 1807
In 1838
2.4 Abundance
2.4.1 Abundance In Universe
3 * 10-4 %2 * 10-7 %
Thallium Metal
5E-09 0.11
2.4.2 Abundance In Sun
~0.0004 %~0.0000002 %
Beryllium Metal
1E-08 0.1
2.4.3 Abundance In Meteorites
0.07 %0.00 %
Gold Metal
1.7E-07 22
2.4.4 Abundance In Earth's Crust
1.50 %0.00 %
Radium Metal
9.9E-12 8.1
2.4.5 Abundance In Oceans
0.04 %0.00 %
Protactinium Metal
2E-23 1.1
2.4.6 Abundance In Humans
0.20 %NA
Radium Metal
1E-13 1.4
3 Uses
3.1 Uses & Benefits
  • 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.
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
3.1.1 Industrial Uses
Ammunition Industry, Chemical Industry
Electrical Industry, Electronic Industry
3.1.2 Medical Uses
Pharmaceutical Industry
NA
3.1.3 Other Uses
NA
Alloys, Mirror Manufacturing
3.2 Biological Properties
3.2.1 Toxicity
Toxic
Low Toxic
3.2.2 Present in Human Body
3.2.3 In Blood
1,620.00 Blood/mg dm-3NA
Plutonium Metal
0 1970
3.2.4 In Bone
2,100.00 p.p.m.0.08 p.p.m.
Plutonium Metal
0 170000
4 Physical
4.1 Melting Point
63.65 °C920.00 °C
Francium Metal
27 3410
4.2 Boiling Point
774.00 °C3,469.00 °C
Flerovium Metal
147 5660
4.3 Appearance
4.3.1 Physical State
Solid
Solid
4.3.2 Color
Silvery Gray
Silvery White
4.3.3 Luster
NA
NA
4.4 Hardness
4.4.1 Mohs Hardness
0.402.50
Cesium Metal
0.2 8.5
4.4.2 Brinell Hardness
0.36 MPa350.00 MPa
Cesium Metal
0.14 3490
4.4.3 Vickers Hardness
NA360.00 MPa
Palladium Metal
121 3430
4.5 Speed of Sound
2,000.00 m/s2,475.00 m/s
Thallium Metal
818 16200
4.6 Optical Properties
4.6.1 Refractive Index
NANA
Mercury Metal
1.000933 1.7229
4.6.2 Reflectivity
NANA
Molybdenum Metal
58 97
4.7 Allotropes
4.7.1 α Allotropes
Not Available
Not Available
4.7.2 β Allotropes
Not Available
Not Available
4.7.3 γ Allotropes
Not Available
Not Available
5 Chemical
5.1 Chemical Formula
K
La
5.2 Isotopes
5.2.1 Known Isotopes
2031
Tennessine Metal
0 38
5.3 Electronegativity
5.3.1 Pauling Electronegativity
0.821.10
Francium Metal
0.7 2.54
5.3.2 Sanderson Electronegativity
0.45NA
Cesium Metal
0.22 2.56
5.3.3 Allred Rochow Electronegativity
0.911.08
Cesium Metal
0.86 1.82
5.3.4 Mulliken-Jaffe Electronegativity
0.73NA
Cesium Metal
0.62 2.48
5.3.5 Allen Electronegativity
0.73NA
Cesium Metal
0.659 2.7
5.4 Electropositivity
5.4.1 Pauling Electropositivity
3.182.90
Gold Metal
1.46 3.3
5.5 Ionization Energies
5.5.1 1st Energy Level
418.80 kJ/mol538.10 kJ/mol
Cesium Metal
375.7 26130
5.5.2 2nd Energy Level
3,052.00 kJ/mol1,067.00 kJ/mol
Ruthenium Metal
710.2162 28750
5.5.3 3rd Energy Level
4,420.00 kJ/mol1,850.30 kJ/mol
Osmium Metal
1600 34230
5.5.4 4th Energy Level
5,877.00 kJ/mol4,819.00 kJ/mol
Thorium Metal
2780 37066
5.5.5 5th Energy Level
7,975.00 kJ/mol5,940.00 kJ/mol
Dubnium Metal
4305.2 97510
5.5.6 6th Energy Level
9,590.00 kJ/molNA
Seaborgium Metal
5715.8 105800
5.5.7 7th Energy level
11,343.00 kJ/molNA
Bohrium Metal
7226.8 114300
5.5.8 8th Energy Level
14,944.00 kJ/molNA
Hassium Metal
8857.4 125300
5.5.9 9th Energy Level
16,963.70 kJ/molNA
Yttrium Metal
14110 134700
5.5.10 10th Energy Level
48,610.00 kJ/molNA
Strontium Metal
17100 144300
5.5.11 11th Energy Level
54,490.00 kJ/molNA
Yttrium Metal
19900 169988
5.5.12 12th Energy Level
60,730.00 kJ/molNA
Molybdenum Metal
22219 189368
5.5.13 13th Energy Level
68,950.00 kJ/molNA
Molybdenum Metal
26930 76015
5.5.14 14th Energy Level
75,900.00 kJ/molNA
Molybdenum Metal
29196 86450
5.5.15 15th Energy Level
83,080.00 kJ/molNA
Manganese Metal
41987 97510
5.5.16 16th Energy Level
93,400.00 kJ/molNA
Iron Metal
47206 109480
5.5.17 17th Energy Level
99,710.00 kJ/molNA
Cobalt Metal
52737 122200
5.5.18 18th Energy Level
NANA
Nickel Metal
58570 134810
5.5.19 19th Energy Level
NANA
Copper Metal
64702 148700
5.5.20 20th Energy Level
NANA
Molybdenum Metal
80400 171200
5.5.21 21st Energy Level
NANA
Molybdenum Metal
87000 179100
5.5.22 22nd Energy Level
NANA
Molybdenum Metal
93400 184900
5.5.23 23rd Energy Level
NANA
Molybdenum Metal
98420 198800
5.5.24 24th Energy Level
NANA
Molybdenum Metal
104400 195200
5.5.25 25th Energy Level
NANA
Molybdenum Metal
121900 121900
5.5.26 26th Energy Level
NANA
Molybdenum Metal
127700 127700
5.5.27 27th Energy Level
NANA
Molybdenum Metal
133800 133800
5.5.28 28th Energy Level
NANA
Molybdenum Metal
139800 139800
5.5.29 29th Energy Level
NANA
Molybdenum Metal
148100 148100
5.5.30 30th Energy Level
NANA
Molybdenum Metal
154500 154500
5.6 Electrochemical Equivalent
1.46 g/amp-hr1.73 g/amp-hr
Beryllium Metal
0.16812 8.3209
5.7 Electron Work Function
2.30 eV3.50 eV
Cesium Metal
2.14 5.65
5.8 Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility
Ionization, Radioactive Isotopes, Solubility
6 Atomic
6.1 Atomic Number
1957
Lithium Metal
3 117
6.2 Electron Configuration
[Ar] 4s1
[Xe] 5d2 6s2
6.3 Crystal Structure
Body Centered Cubic (BCC)
Double Hexagonal Close Packed (DHCP)
6.3.1 Crystal Lattice
6.4 Atom
6.4.1 Number of Protons
1957
Lithium Metal
3 117
6.4.2 Number of Neutrons
2082
Lithium Metal
4 184
6.4.3 Number of Electrons
1957
Lithium Metal
3 117
6.5 Radius of an Atom
6.5.1 Atomic Radius
227.00 pm187.00 pm
Beryllium Metal
112 265
6.5.2 Covalent Radius
203.00 pm207.00 pm
Beryllium Metal
96 260
6.5.3 Van der Waals Radius
275.00 pm240.00 pm
Zinc Metal
139 348
6.6 Atomic Weight
39.10 amu138.91 amu
Lithium Metal
6.94 294
6.7 Atomic Volume
45.46 cm3/mol20.73 cm3/mol
Manganese Metal
1.39 71.07
6.8 Adjacent Atomic Numbers
6.8.1 Previous Element
6.8.2 Next Element
6.9 Valence Electron Potential
10.40 (-eV)40.71 (-eV)
Francium Metal
8 392.42
6.10 Lattice Constant
532.80 pm377.20 pm
Beryllium Metal
228.58 891.25
6.11 Lattice Angles
π/2, π/2, π/2
π/2, π/2, 2 π/3
6.12 Lattice C/A Ratio
NA1.62
Beryllium Metal
1.567 1.886
7 Mechanical
7.1 Density
7.1.1 Density At Room Temperature
0.86 g/cm36.16 g/cm3
Lithium Metal
0.534 40.7
7.1.2 Density When Liquid (at m.p.)
0.83 g/cm35.94 g/cm3
Lithium Metal
0.512 20
7.2 Tensile Strength
NANA
Indium Metal
2.5 11000
7.3 Viscosity
NANA
Mercury Metal
0.001526 0.001526
7.4 Vapor Pressure
7.4.1 Vapor Pressure at 1000 K
NANA
Cerium Metal
2.47E-11 121
7.4.2 Vapor Pressure at 2000 K
NA0.98 (Pa)
Tungsten Metal
2.62E-10 774
7.5 Elasticity properties
7.5.1 Shear Modulus
1.30 GPa14.30 GPa
Palladium
1.3 222
7.5.2 Bulk Modulus
3.10 GPa27.90 GPa
Cesium Metal
1.6 462
7.5.3 Young's Modulus
3.53 GPa36.60 GPa
Cesium Metal
1.7 528
7.6 Poisson Ratio
NA0.28
Beryllium Metal
0.032 0.47
7.7 Other Mechanical Properties
NA
Ductile
8 Magnetic
8.1 Magnetic Characteristics
8.1.1 Specific Gravity
0.866.17
Lithium Metal
0.53 4500
8.1.2 Magnetic Ordering
Paramagnetic
Paramagnetic
8.1.3 Permeability
NANA
Bismuth Metal
1.25643E-06 0.0063
8.1.4 Susceptibility
NANA
Bismuth Metal
-0.000166 200000
8.2 Electrical Properties
8.2.1 Electrical Property
Conductor
Conductor
8.2.2 Resistivity
72.00 nΩ·m615.00 nΩ·m
Thallium Metal
0.18 961
8.2.3 Electrical Conductivity
0.14 106/cm Ω0.01 106/cm Ω
Plutonium Metal
0.00666 0.63
8.2.4 Electron Affinity
48.40 kJ/mol48.00 kJ/mol
Mercury Metal
0 222.8
9 Thermal
9.1 Specific Heat
0.75 J/(kg K)0.19 J/(kg K)
Americium Metal
0.11 3.6
9.2 Molar Heat Capacity
29.60 J/mol·K27.11 J/mol·K
Beryllium Metal
16.443 62.7
9.3 Thermal Conductivity
102.50 W/m·K13.40 W/m·K
Neptunium Metal
6.3 429
9.4 Critical Temperature
2,223.00 KNA
Ytterbium Metal
26.3 3223
9.5 Thermal Expansion
83.30 µm/(m·K)12.10 µm/(m·K)
Tungsten Metal
4.5 97
9.6 Enthalpy
9.6.1 Enthalpy of Vaporization
77.50 kJ/mol399.60 kJ/mol
Zinc Metal
7.32 799.1
9.6.2 Enthalpy of Fusion
2.32 kJ/mol6.20 kJ/mol
Cesium Metal
2.1 35.23
9.6.3 Enthalpy of Atomization
89.50 kJ/mol431.00 kJ/mol
Mercury Metal
61.5 837
9.7 Standard Molar Entropy
64.70 J/mol.K56.90 J/mol.K
Beryllium Metal
9.5 198.1