Radium vs Francium
Periodic Table
Symbol
Ra
Fr
Group Number
2
16
1
17
Period Number
7
7
Block
s block
s block
Element Family
Alkaline Earth
Alkali
CAS Number
7440144
99+
7440735
18
Space Group Name
Im_ 3m
Not Available
Space Group Number
229.00
1
Not Available
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.
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
Sources
Mining, Ores of metals
Formed by Decay Process, Mining
History
Who Discovered
Not Available
Marguerite Perey
Discovery
In 1898
In 1939
Abundance
Abundance In Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
99+
Not Available
Abundance In Humans
0.00 %
20
Not Available
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.
- Francium has no known uses as it has a half life of only 22 minutes.
Industrial Uses
NA
NA
Medical Uses
Pharmaceutical Industry
NA
Other Uses
NA
NA
Biological Properties
Toxicity
Highly Toxic
NA
Present in Human Body
No
No
In Blood
Not Available
0.00 Blood/mg dm-3
37
In Bone
Not Available
0.00 p.p.m.
36
Physical Properties
Melting Point
700.00 °C
99+
27.00 °C
99+
Boiling Point
1,737.00 °C
99+
677.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
NA
Luster
Metallic
NA
Hardness
Speed of Sound
Not Available
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
Ra
Fr
Isotopes
Known Isotopes
33
6
33
6
Electronegativity
Pauling Electronegativity
0.90
99+
0.70
99+
Allred Rochow Electronegativity
0.97
38
0.86
99+
Mulliken-Jaffe Electronegativity
0.92
20
0.68
25
Allen Electronegativity
0.89
99+
0.67
99+
Electropositivity
Pauling Electropositivity
3.10
5
3.30
1
Ionization Energies
1st Energy Level
509.30 kJ/mol
99+
380.00 kJ/mol
99+
2nd Energy Level
979.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
4.22 g/amp-hr
6
8.32 g/amp-hr
1
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
88
30
87
31
Electron Configuration
[Rn] 7s2
[Rn] 7s1
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
87
31
Number of Neutrons
138
16
136
17
Number of Electrons
88
30
87
31
Radius of an Atom
Covalent Radius
221.00 pm
3
260.00 pm
1
Van der Waals Radius
283.00 pm
4
348.00 pm
1
Atomic Weight
226.00 amu
26
223.00 amu
27
Atomic Volume
45.20 cm3/mol
4
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
20.10 (-eV)
99+
8.00 (-eV)
99+
Lattice Constant
514.80 pm
13
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
5.50 g/cm3
99+
1.87 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
5.00
99+
Not Available
Magnetic Ordering
Nonmagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Poor Conductor
Resistivity
100.00 nΩ·m
31
3.00 nΩ·m
99+
Electrical Conductivity
Not Available
0.03 106/cm Ω
40
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
18.60 W/m·K
99+
15.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Atomization
163.00 kJ/mol
99+
71.00 kJ/mol
99+
Standard Molar Entropy
71.00 J/mol.K
14
Not Available
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