Silver Francium Comparison
Periodic Table
Symbol
Ag
Fr
Group Number
11
7
1
17
Period Number
5
7
Block
d block
s block
Element Family
Transition Metal
Alkali
CAS Number
7440224
99+
7440735
18
Space Group Name
Fm_ 3m
Not Available
Space Group Number
225.00
2
Not Available
Facts
Interesting Facts
- It is the most reflective element.
- Silver is the second most ductile metal after Gold.
- It is also used in Dentistry as a dental alloys for clips and crowning.
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
Sources
Earth's crust, Found in Minerals, Ores of metals
Formed by Decay Process, Mining
History
Who Discovered
Unknown
Marguerite Perey
Discovery
Before 5000 BC
In 1939
Abundance
Abundance In Universe
6 * 10-8 %
26
Not Available
Abundance In Sun
~0.0000001 %
26
~-9999 %
Abundance In Meteorites
0.00 %
38
Not Available
Abundance In Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
19
Not Available
Uses
Uses & Benefits
- Silver is mainly used for Jewelry and show piece.
- It is used for manufacturing high quality mirrors due to its reflectivity property.
- Francium has no known uses as it has a half life of only 22 minutes.
Industrial Uses
Chemical Industry, Clothing Industry, Electrical Industry
NA
Medical Uses
Dentistry, Pharmaceutical Industry
NA
Other Uses
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
NA
Biological Properties
Toxicity
Non Toxic
NA
Present in Human Body
Yes
No
In Blood
0.00 Blood/mg dm-3
29
0.00 Blood/mg dm-3
37
In Bone
0.44 p.p.m.
20
0.00 p.p.m.
36
Physical Properties
Melting Point
961.93 °C
99+
27.00 °C
99+
Boiling Point
2,212.00 °C
99+
677.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
NA
Luster
Metallic
NA
Hardness
Mohs Hardness
2.50
14
Not Available
Brinell Hardness
251.00 MPa
37
Not Available
Vickers Hardness
229.00 MPa
30
Not Available
Speed of Sound
2,680.00 m/s
34
Not Available
Optical Properties
Reflectivity
97.00 %
1
Not Available
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
Ag
Fr
Isotopes
Known Isotopes
36
3
33
6
Electronegativity
Pauling Electronegativity
1.93
9
0.70
99+
Sanderson Electronegativity
1.83
11
Not Available
Allred Rochow Electronegativity
1.42
18
0.86
99+
Mulliken-Jaffe Electronegativity
1.47
15
0.68
25
Allen Electronegativity
1.87
7
0.67
99+
Electropositivity
Pauling Electropositivity
2.07
99+
3.30
1
Ionization Energies
1st Energy Level
731.00 kJ/mol
27
380.00 kJ/mol
99+
2nd Energy Level
2,070.00 kJ/mol
11
Not Available
3rd Energy Level
3,361.00 kJ/mol
19
Not Available
Electrochemical Equivalent
4.02 g/amp-hr
7
8.32 g/amp-hr
1
Electron Work Function
4.26 eV
20
Not Available
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
47
99+
87
31
Electron Configuration
[Kr] 4d10 5s1
[Rn] 7s1
Crystal Structure
Face Centered Cubic (FCC)
Body Centered Cubic (BCC)
Crystal Lattice
FCC-Crystal-Structure-of-Silver.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
47
99+
87
31
Number of Neutrons
61
99+
136
17
Number of Electrons
47
99+
87
31
Radius of an Atom
Atomic Radius
144.00 pm
36
Not Available
Covalent Radius
145.00 pm
39
260.00 pm
1
Van der Waals Radius
172.00 pm
38
348.00 pm
1
Atomic Weight
107.87 amu
99+
223.00 amu
27
Atomic Volume
10.30 cm3/mol
99+
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
11.40 (-eV)
99+
8.00 (-eV)
99+
Lattice Constant
408.53 pm
20
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
10.49 g/cm3
35
1.87 g/cm3
99+
Density When Liquid (at m.p.)
9.32 g/cm3
21
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
14
Not Available
Elasticity properties
Shear Modulus
30.00 GPa
23
Not Available
Bulk Modulus
100.00 GPa
16
Not Available
Young's Modulus
83.00 GPa
23
Not Available
Poisson Ratio
0.37
7
Not Available
Other Mechanical Properties
Ductile, Malleable
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
10.50
26
Not Available
Magnetic Ordering
Diamagnetic
Paramagnetic
Susceptibility
0.00
5
Not Available
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
15.87 nΩ·m
99+
3.00 nΩ·m
99+
Electrical Conductivity
0.63 106/cm Ω
1
0.03 106/cm Ω
40
Electron Affinity
125.60 kJ/mol
5
Not Available
Thermal Properties
Specific Heat
0.24 J/(kg K)
25
Not Available
Molar Heat Capacity
25.35 J/mol·K
99+
Not Available
Thermal Conductivity
429.00 W/m·K
1
15.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
18.90 µm/(m·K)
23
Not Available
Enthalpy
Enthalpy of Vaporization
255.10 kJ/mol
37
Not Available
Enthalpy of Fusion
11.30 kJ/mol
31
Not Available
Enthalpy of Atomization
284.50 kJ/mol
37
71.00 kJ/mol
99+
Standard Molar Entropy
42.60 J/mol.K
35
Not Available
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