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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
-  
Fm_ 3m  
Space Group Number
225.00  
3
225.00  
3
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  
-  
Discovery
In 1939  
Before 5000 BC  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
27
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
19
Abundance In Humans
0.00 %  
24
0.00 %  
24
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
-  
Chemical Industry, Clothing Industry, Electrical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry  
Other Uses
-  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
-  
Non Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
29
In Bone
0.00 p.p.m.  
99+
0.44 p.p.m.  
24
Physical
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
-  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
0.20  
27
2.50  
15
Brinell Hardness
119.00 MPa  
99+
251.00 MPa  
99+
Vickers Hardness
300.00 MPa  
99+
229.00 MPa  
99+
Speed of Sound
2,440.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.70  
27
0.16  
99+
Reflectivity
72.00 %  
11
97.00 %  
1
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Fr  
Ag  
Isotopes
  
  
Known Isotopes
33  
6
36  
3
Electronegativity
  
  
Pauling Electronegativity
0.70  
99+
1.93  
10
Sanderson Electronegativity
0.70  
99+
1.83  
14
Allred Rochow Electronegativity
0.86  
99+
1.42  
19
Mulliken-Jaffe Electronegativity
0.68  
99+
1.47  
28
Allen Electronegativity
0.67  
99+
1.87  
10
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
392.80 kJ/mol  
99+
2,070.00 kJ/mol  
11
3rd Energy Level
392.80 kJ/mol  
99+
3,361.00 kJ/mol  
19
4th Energy Level
392.80 kJ/mol  
99+
7,310.00 kJ/mol  
10
5th Energy Level
392.00 kJ/mol  
99+
7,310.00 kJ/mol  
24
6th Energy Level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
39
7th Energy level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
33
8th Energy Level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
9th Energy Level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
27
10th Energy Level
392.00 kJ/mol  
99+
7,310.00 kJ/mol  
32
11th Energy Level
392.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
12th Energy Level
38,000.00 kJ/mol  
23
7,310.00 kJ/mol  
99+
13th Energy Level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
25
14th Energy Level
380.00 kJ/mol  
99+
731.00 kJ/mol  
99+
15th Energy Level
67,700.00 kJ/mol  
32
73,100.00 kJ/mol  
22
16th Energy Level
39,200.00 kJ/mol  
99+
73,100.00 kJ/mol  
17
17th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
38
18th Energy Level
3,920.00 kJ/mol  
99+
7,310.00 kJ/mol  
28
19th Energy Level
392.80 kJ/mol  
99+
731.00 kJ/mol  
35
20th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
29
21st Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
99+
22nd Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
23
23rd Energy Level
392.80 kJ/mol  
99+
731.00 kJ/mol  
99+
24th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
22
25th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
22
26th Energy Level
392.80 kJ/mol  
99+
731.00 kJ/mol  
22
27th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
21
28th Energy Level
380.00 kJ/mol  
99+
731.00 kJ/mol  
27
29th Energy Level
392.00 kJ/mol  
99+
731.00 kJ/mol  
28
30th Energy Level
677.00 kJ/mol  
31
731.00 kJ/mol  
22
Electrochemical Equivalent
8.32 g/amp-hr  
1
4.02 g/amp-hr  
7
Electron Work Function
4.07 eV  
33
4.26 eV  
27
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Chemical Stability, Ionization, Solubility  
Atomic
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  
18
61  
99+
Number of Electrons
87  
31
47  
99+
Radius of an Atom
  
  
Atomic Radius
348.00 pm  
1
144.00 pm  
38
Covalent Radius
260.00 pm  
1
145.00 pm  
99+
Van der Waals Radius
348.00 pm  
1
172.00 pm  
99+
Atomic Weight
223.00 amu  
27
107.87 amu  
99+
Atomic Volume
71.00 cm3/mol  
2
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
440.00 pm  
21
408.53 pm  
23
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.56  
99+
1.59  
26
Mechanical
Density
  
  
Density At Room Temperature
1.87 g/cm3  
99+
10.49 g/cm3  
37
Density When Liquid (at m.p.)
1.87 g/cm3  
99+
9.32 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
170.00 MPa  
21
Viscosity
0.00  
25
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
14
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
3.60 GPa  
99+
30.00 GPa  
27
Bulk Modulus
6.00 GPa  
99+
100.00 GPa  
16
Young's Modulus
0.00 GPa  
99+
83.00 GPa  
25
Poisson Ratio
0.44  
3
0.37  
7
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
0.87  
99+
10.50  
39
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Permeability
0.00 H/m  
13
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
32
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  
99+
0.63 106/cm Ω  
1
Electron Affinity
0.70 kJ/mol  
99+
125.60 kJ/mol  
5
Thermal
Specific Heat
0.15 J/(kg K)  
37
0.24 J/(kg K)  
25
Molar Heat Capacity
27.00 J/mol·K  
29
25.35 J/mol·K  
99+
Thermal Conductivity
15.00 W/m·K  
99+
429.00 W/m·K  
1
Critical Temperature
300.00 K  
99+
1,235.00 K  
99+
Thermal Expansion
18.90 µm/(m·K)  
25
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
67.00 kJ/mol  
99+
255.10 kJ/mol  
99+
Enthalpy of Fusion
2.30 kJ/mol  
99+
11.30 kJ/mol  
37
Enthalpy of Atomization
71.00 kJ/mol  
99+
284.50 kJ/mol  
99+
Standard Molar Entropy
42.00 J/mol.K  
99+
42.60 J/mol.K  
99+
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