Potassium vs Fermium
Periodic Table
Symbol
K
Fm
Group Number
1
17
Not Available
Period Number
4
7
Block
s block
f block
Element Family
Alkali
Actinide
CAS Number
7440097
99+
7440724
19
Space Group Name
Im_ 3m
Not Available
Space Group Number
229.00
1
Not Available
Facts
Interesting Facts
- In the list of most abundant element Potassium is ranked 7th.
- Potassium can easily be sliced (chopped) down using knife.
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
Sources
Found in Minerals, Mining
Bombarding Pu-239 with Neutrons
History
Who Discovered
Humphry Davy
Lawrence Berkeley National Laboratory
Discovery
In 1807
In 1952
Abundance
Abundance In Universe
3 * 10-4 %
9
Not Available
Abundance In Sun
~0.0004 %
9
~-9999 %
Abundance In Meteorites
0.07 %
9
Not Available
Abundance In Earth's Crust
1.50 %
6
Not Available
Abundance In Oceans
0.04 %
3
Not Available
Abundance In Humans
0.20 %
2
Not Available
Uses
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.
- Currently known uses of Fermium metal are limited to research purpose only.
Industrial Uses
Ammunition Industry, Chemical Industry
NA
Medical Uses
Pharmaceutical Industry
NA
Other Uses
NA
NA
Biological Properties
Toxicity
Toxic
Unknown
Present in Human Body
Yes
No
In Blood
1,620.00 Blood/mg dm-3
2
0.00 Blood/mg dm-3
37
In Bone
2,100.00 p.p.m.
3
0.00 p.p.m.
36
Physical Properties
Melting Point
63.65 °C
99+
1,527.00 °C
26
Boiling Point
774.00 °C
99+
Not Available
Appearance
Physical State
Solid
Solid
Color
Silvery Gray
Unknown
Luster
NA
Not Defined
Hardness
Mohs Hardness
0.40
23
Not Available
Brinell Hardness
0.36 MPa
99+
Not Available
Speed of Sound
2,000.00 m/s
99+
Not Available
Optical Properties
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
K
Fm
Isotopes
Known Isotopes
20
19
18
21
Electronegativity
Pauling Electronegativity
0.82
99+
1.30
32
Sanderson Electronegativity
0.45
31
Not Available
Allred Rochow Electronegativity
0.91
39
1.20
27
Mulliken-Jaffe Electronegativity
0.73
23
Not Available
Allen Electronegativity
0.73
99+
Not Available
Electropositivity
Pauling Electropositivity
3.18
3
2.70
22
Ionization Energies
1st Energy Level
418.80 kJ/mol
99+
627.00 kJ/mol
99+
2nd Energy Level
3,052.00 kJ/mol
5
1,225.00 kJ/mol
99+
3rd Energy Level
4,420.00 kJ/mol
8
2,363.00 kJ/mol
99+
4th Energy Level
5,877.00 kJ/mol
9
3,792.00 kJ/mol
99+
5th Energy Level
7,975.00 kJ/mol
8
Not Available
6th Energy Level
9,590.00 kJ/mol
13
Not Available
7th Energy level
11,343.00 kJ/mol
17
Not Available
8th Energy Level
14,944.00 kJ/mol
13
Not Available
9th Energy Level
16,963.70 kJ/mol
15
Not Available
10th Energy Level
48,610.00 kJ/mol
3
Not Available
11th Energy Level
54,490.00 kJ/mol
4
Not Available
12th Energy Level
60,730.00 kJ/mol
4
Not Available
13th Energy Level
68,950.00 kJ/mol
4
Not Available
14th Energy Level
75,900.00 kJ/mol
5
Not Available
15th Energy Level
83,080.00 kJ/mol
6
Not Available
16th Energy Level
93,400.00 kJ/mol
7
Not Available
17th Energy Level
99,710.00 kJ/mol
8
Not Available
Electrochemical Equivalent
1.46 g/amp-hr
99+
3.20 g/amp-hr
13
Electron Work Function
2.30 eV
99+
Not Available
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
19
99+
100
18
Electron Configuration
[Ar] 4s1
[Rn] 5f12 7s2
Crystal Structure
Body Centered Cubic (BCC)
Not Known
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
Unknown-Crystal-Structure-of-Fermium.jpg#100
Atom
Number of Protons
19
99+
100
18
Number of Neutrons
20
99+
157
7
Number of Electrons
19
99+
100
18
Radius of an Atom
Atomic Radius
227.00 pm
3
Not Available
Covalent Radius
203.00 pm
9
Not Available
Van der Waals Radius
275.00 pm
5
245.00 pm
9
Atomic Weight
39.10 amu
99+
257.00 amu
15
Atomic Volume
45.46 cm3/mol
3
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
10.40 (-eV)
99+
Not Available
Lattice Constant
532.80 pm
12
Not Available
Lattice Angles
π/2, π/2, π/2
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
0.86 g/cm3
99+
Not Available
Density When Liquid (at m.p.)
0.83 g/cm3
99+
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
1.30 GPa
99+
Not Available
Bulk Modulus
3.10 GPa
99+
Not Available
Young's Modulus
3.53 GPa
99+
Not Available
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
0.86
99+
Not Available
Magnetic Ordering
Paramagnetic
Unknown
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
72.00 nΩ·m
37
Not Available
Electrical Conductivity
0.14 106/cm Ω
14
Not Available
Electron Affinity
48.40 kJ/mol
22
Not Available
Thermal Properties
Specific Heat
0.75 J/(kg K)
6
Not Available
Molar Heat Capacity
29.60 J/mol·K
6
Not Available
Thermal Conductivity
102.50 W/m·K
15
Not Available
Critical Temperature
2,223.00 K
3
Not Available
Thermal Expansion
83.30 µm/(m·K)
3
Not Available
Enthalpy
Enthalpy of Vaporization
77.50 kJ/mol
99+
Not Available
Enthalpy of Fusion
2.32 kJ/mol
99+
Not Available
Enthalpy of Atomization
89.50 kJ/mol
99+
Not Available
Standard Molar Entropy
64.70 J/mol.K
18
Not Available
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