Francium Osmium Comparison
Periodic Table
Symbol
Fr
Os
Group Number
1
17
8
10
Period Number
7
6
Block
s block
d block
Element Family
Alkali
Transition Metal
CAS Number
7440735
18
7440042
99+
Space Group Name
Not Available
P63/mmc
Space Group Number
Not Available
194.00
5
Facts
Interesting Facts
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
- Osmium metal does not oxidize in air unless it is heated.
- But if it heated den it forms Osmium Tetroxide, which is highly toxic.
Sources
Formed by Decay Process, Mining
Found As a By-product, Found in Minerals, Mining
History
Who Discovered
Marguerite Perey
Smithson Tennant
Discovery
In 1939
In 1803
Abundance
Abundance In Universe
Not Available
3 * 10-7 %
21
Abundance In Sun
~-9999 %
~0.0000002 %
25
Abundance In Meteorites
Not Available
0.00 %
28
Abundance In Earth's Crust
Not Available
0.00 %
99+
Uses
Uses & Benefits
- Francium has no known uses as it has a half life of only 22 minutes.
- Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
- It is also used as industrial catalyst to speed up the chemical reaction.
Industrial Uses
NA
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
NA
Alloys
Biological Properties
Toxicity
NA
Highly Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
Not Available
In Bone
0.00 p.p.m.
36
Not Available
Physical Properties
Melting Point
27.00 °C
99+
3,045.00 °C
3
Boiling Point
677.00 °C
99+
5,027.00 °C
6
Appearance
Physical State
Solid
Solid
Color
NA
Silvery Bluish-Gray
Luster
NA
Metallic
Hardness
Mohs Hardness
Not Available
7.00
3
Brinell Hardness
Not Available
3,490.00 MPa
1
Speed of Sound
Not Available
4,940.00 m/s
11
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
Fr
Os
Isotopes
Known Isotopes
33
6
35
4
Electronegativity
Pauling Electronegativity
0.70
99+
2.20
4
Allred Rochow Electronegativity
0.86
99+
1.52
12
Mulliken-Jaffe Electronegativity
0.68
25
Not Available
Allen Electronegativity
0.67
99+
1.65
19
Electropositivity
Pauling Electropositivity
3.30
1
1.80
99+
Ionization Energies
1st Energy Level
380.00 kJ/mol
99+
840.00 kJ/mol
12
2nd Energy Level
Not Available
1,309.80 kJ/mol
99+
3rd Energy Level
Not Available
1,600.00 kJ/mol
99+
Electrochemical Equivalent
8.32 g/amp-hr
1
1.77 g/amp-hr
38
Electron Work Function
Not Available
4.83 eV
8
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Ionization, Solubility
Atomic Properties
Atomic Number
87
31
76
40
Electron Configuration
[Rn] 7s1
[Xe] 4f14 5d6 6s2
Crystal Structure
Body Centered Cubic (BCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
87
31
76
39
Number of Neutrons
136
17
114
25
Number of Electrons
87
31
76
39
Radius of an Atom
Atomic Radius
Not Available
133.80 pm
99+
Covalent Radius
260.00 pm
1
Not Available
Van der Waals Radius
348.00 pm
1
216.00 pm
24
Atomic Weight
223.00 amu
27
190.23 amu
35
Atomic Volume
Not Available
8.49 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
8.00 (-eV)
99+
91.40 (-eV)
12
Lattice Constant
Not Available
273.44 pm
99+
Lattice Angles
NA
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.58
14
Mechanical Properties
Density
Density At Room Temperature
1.87 g/cm3
99+
22.59 g/cm3
9
Density When Liquid (at m.p.)
Not Available
20.00 g/cm3
1
Tensile Strength
Not Available
1,000.00 MPa
4
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
28
Elasticity properties
Shear Modulus
Not Available
222.00 GPa
1
Bulk Modulus
Not Available
462.00 GPa
1
Poisson Ratio
Not Available
0.25
24
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
22.57
2
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Poor Conductor
Conductor
Resistivity
3.00 nΩ·m
99+
81.20 nΩ·m
35
Electrical Conductivity
0.03 106/cm Ω
40
0.11 106/cm Ω
18
Electron Affinity
Not Available
106.10 kJ/mol
9
Thermal Properties
Specific Heat
Not Available
0.13 J/(kg K)
39
Molar Heat Capacity
Not Available
24.70 J/mol·K
99+
Thermal Conductivity
15.00 W/m·K
99+
87.60 W/m·K
19
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
5.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
627.60 kJ/mol
7
Enthalpy of Fusion
Not Available
29.30 kJ/mol
4
Enthalpy of Atomization
71.00 kJ/mol
99+
669.00 kJ/mol
6
Standard Molar Entropy
Not Available
32.60 J/mol.K
99+
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