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Francium vs Silver

Francium
Silver
Silver vs Francium


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