Radium Potassium Comparison
Periodic Table
Symbol
Ra
K
Group Number
2
16
1
17
Period Number
7
4
Block
s block
s block
Element Family
Alkaline Earth
Alkali
CAS Number
7440144
99+
7440097
99+
Space Group Name
Im_ 3m
Im_ 3m
Space Group Number
229.00
1
229.00
1
Facts
Interesting Facts
- Radium metal is the heaviest metal of Alkaline earth metals column.
- Radium metal is highly radioactive and does not have any stable isotopes.
- In the list of most abundant element Potassium is ranked 7th.
- Potassium can easily be sliced (chopped) down using knife.
Sources
Mining, Ores of metals
Found in Minerals, Mining
History
Who Discovered
Not Available
Humphry Davy
Discovery
In 1898
In 1807
Abundance
Abundance In Universe
Not Available
3 * 10-4 %
9
Abundance In Sun
~-9999 %
~0.0004 %
9
Abundance In Meteorites
Not Available
0.07 %
9
Abundance In Earth's Crust
0.00 %
99+
1.50 %
6
Abundance In Oceans
0.00 %
99+
0.04 %
3
Abundance In Humans
0.00 %
20
0.20 %
2
Uses
Uses & Benefits
- It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
- It is used in luminous paints.
- 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
NA
Ammunition Industry, Chemical Industry
Medical Uses
Pharmaceutical Industry
Pharmaceutical Industry
Other Uses
NA
NA
Biological Properties
Toxicity
Highly Toxic
Toxic
Present in Human Body
No
Yes
In Blood
Not Available
1,620.00 Blood/mg dm-3
2
In Bone
Not Available
2,100.00 p.p.m.
3
Physical Properties
Melting Point
700.00 °C
99+
63.65 °C
99+
Boiling Point
1,737.00 °C
99+
774.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Metallic
NA
Hardness
Mohs Hardness
Not Available
0.40
23
Brinell Hardness
Not Available
0.36 MPa
99+
Speed of Sound
Not Available
2,000.00 m/s
99+
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
Ra
K
Isotopes
Known Isotopes
33
6
20
19
Electronegativity
Pauling Electronegativity
0.90
99+
0.82
99+
Sanderson Electronegativity
Not Available
0.45
31
Allred Rochow Electronegativity
0.97
38
0.91
39
Mulliken-Jaffe Electronegativity
0.92
20
0.73
23
Allen Electronegativity
0.89
99+
0.73
99+
Electropositivity
Pauling Electropositivity
3.10
5
3.18
3
Ionization Energies
1st Energy Level
509.30 kJ/mol
99+
418.80 kJ/mol
99+
2nd Energy Level
979.00 kJ/mol
99+
3,052.00 kJ/mol
5
3rd Energy Level
Not Available
4,420.00 kJ/mol
8
4th Energy Level
Not Available
5,877.00 kJ/mol
9
5th Energy Level
Not Available
7,975.00 kJ/mol
8
6th Energy Level
Not Available
9,590.00 kJ/mol
13
7th Energy level
Not Available
11,343.00 kJ/mol
17
8th Energy Level
Not Available
14,944.00 kJ/mol
13
9th Energy Level
Not Available
16,963.70 kJ/mol
15
10th Energy Level
Not Available
48,610.00 kJ/mol
3
11th Energy Level
Not Available
54,490.00 kJ/mol
4
12th Energy Level
Not Available
60,730.00 kJ/mol
4
13th Energy Level
Not Available
68,950.00 kJ/mol
4
14th Energy Level
Not Available
75,900.00 kJ/mol
5
15th Energy Level
Not Available
83,080.00 kJ/mol
6
16th Energy Level
Not Available
93,400.00 kJ/mol
7
17th Energy Level
Not Available
99,710.00 kJ/mol
8
Electrochemical Equivalent
4.22 g/amp-hr
6
1.46 g/amp-hr
99+
Electron Work Function
Not Available
2.30 eV
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Chemical Stability, Flammability, Ionization, Solubility
Atomic Properties
Atomic Number
88
30
19
99+
Electron Configuration
[Rn] 7s2
[Ar] 4s1
Crystal Structure
Body Centered Cubic (BCC)
Body Centered Cubic (BCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
88
30
19
99+
Number of Neutrons
138
16
20
99+
Number of Electrons
88
30
19
99+
Radius of an Atom
Atomic Radius
Not Available
227.00 pm
3
Covalent Radius
221.00 pm
3
203.00 pm
9
Van der Waals Radius
283.00 pm
4
275.00 pm
5
Atomic Weight
226.00 amu
26
39.10 amu
99+
Atomic Volume
45.20 cm3/mol
4
45.46 cm3/mol
3
Adjacent Atomic Numbers
Valence Electron Potential
20.10 (-eV)
99+
10.40 (-eV)
99+
Lattice Constant
514.80 pm
13
532.80 pm
12
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
5.50 g/cm3
99+
0.86 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
0.83 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
Not Available
1.30 GPa
99+
Bulk Modulus
Not Available
3.10 GPa
99+
Young's Modulus
Not Available
3.53 GPa
99+
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
5.00
99+
0.86
99+
Magnetic Ordering
Nonmagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
100.00 nΩ·m
31
72.00 nΩ·m
37
Electrical Conductivity
Not Available
0.14 106/cm Ω
14
Electron Affinity
Not Available
48.40 kJ/mol
22
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.75 J/(kg K)
6
Molar Heat Capacity
Not Available
29.60 J/mol·K
6
Thermal Conductivity
18.60 W/m·K
99+
102.50 W/m·K
15
Critical Temperature
Not Available
2,223.00 K
3
Thermal Expansion
Not Available
83.30 µm/(m·K)
3
Enthalpy
Enthalpy of Vaporization
Not Available
77.50 kJ/mol
99+
Enthalpy of Fusion
Not Available
2.32 kJ/mol
99+
Enthalpy of Atomization
163.00 kJ/mol
99+
89.50 kJ/mol
99+
Standard Molar Entropy
71.00 J/mol.K
14
64.70 J/mol.K
18
|
||
|
||
|
