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Radium vs Silver

Radium
Silver
Silver vs Radium


Periodic Table
Symbol
Ra  
Ag  
Group Number
2  
16
11  
7
Period Number
7  
5  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7440144  
99+
7440224  
99+
Space Group Name
Im_ 3m  
Fm_ 3m  
Space Group Number
229.00  
2
225.00  
3
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.
  
  • 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
Mining, Ores of metals  
Earth's crust, Found in Minerals, Ores of metals  
History
  
  
Who Discovered
-  
-  
Discovery
In 1898  
Before 5000 BC  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
27
Abundance In Sun
0.00 %  
26
0.00 %  
26
Abundance In Meteorites
-  
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
0.00 %  
19
Abundance In Humans
0.00 %  
23
0.00 %  
24
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.
  
  • 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
Pharmaceutical Industry  
Dentistry, Pharmaceutical Industry  
Other Uses
-  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Highly Toxic  
Non Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
29
In Bone
0.00 p.p.m.  
99+
0.44 p.p.m.  
24
Physical
Melting Point
700.00 °C  
99+
961.93 °C  
99+
Boiling Point
1,737.00 °C  
99+
2,212.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
2.50  
15
Brinell Hardness
700.00 MPa  
17
251.00 MPa  
99+
Vickers Hardness
140.00 MPa  
99+
229.00 MPa  
99+
Speed of Sound
3,150.00 m/s  
37
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
0.16  
99+
Reflectivity
83.00 %  
6
97.00 %  
1
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Ag  
Isotopes
  
  
Known Isotopes
33  
6
36  
3
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
1.93  
10
Sanderson Electronegativity
0.89  
99+
1.83  
14
Allred Rochow Electronegativity
0.97  
39
1.42  
19
Mulliken-Jaffe Electronegativity
0.92  
99+
1.47  
28
Allen Electronegativity
0.89  
99+
1.87  
10
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
2.07  
99+
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
27
2nd Energy Level
979.00 kJ/mol  
99+
2,070.00 kJ/mol  
11
3rd Energy Level
509.30 kJ/mol  
99+
3,361.00 kJ/mol  
19
4th Energy Level
5,093.00 kJ/mol  
27
7,310.00 kJ/mol  
10
5th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
24
6th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
39
7th Energy level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
33
8th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
9th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
27
10th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
32
11th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
12th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
99+
13th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
25
14th Energy Level
5,090.00 kJ/mol  
99+
731.00 kJ/mol  
99+
15th Energy Level
50,900.00 kJ/mol  
99+
73,100.00 kJ/mol  
22
16th Energy Level
50,900.00 kJ/mol  
99+
73,100.00 kJ/mol  
17
17th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
38
18th Energy Level
5,090.00 kJ/mol  
99+
7,310.00 kJ/mol  
28
19th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
35
20th Energy Level
509.00 kJ/mol  
99+
731.00 kJ/mol  
29
21st Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
99+
22nd Energy Level
509.00 kJ/mol  
99+
731.00 kJ/mol  
23
23rd Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
99+
24th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
22
25th Energy Level
509.00 kJ/mol  
99+
731.00 kJ/mol  
22
26th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
22
27th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
21
28th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
27
29th Energy Level
509.30 kJ/mol  
99+
731.00 kJ/mol  
28
30th Energy Level
509.00 kJ/mol  
99+
731.00 kJ/mol  
22
Electrochemical Equivalent
4.22 g/amp-hr  
6
4.02 g/amp-hr  
7
Electron Work Function
4.30 eV  
25
4.26 eV  
27
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Ionization, Solubility  
Atomic
Atomic Number
88  
30
47  
99+
Electron Configuration
[Rn] 7s2  
[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
88  
30
47  
99+
Number of Neutrons
138  
17
61  
99+
Number of Electrons
88  
30
47  
99+
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
144.00 pm  
38
Covalent Radius
221.00 pm  
3
145.00 pm  
99+
Van der Waals Radius
283.00 pm  
5
172.00 pm  
99+
Atomic Weight
226.00 amu  
26
107.87 amu  
99+
Atomic Volume
45.20 cm3/mol  
5
10.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Palladium
  
Next Element
Actinium
  
Cadmium
  
Valence Electron Potential
20.10 (-eV)  
99+
11.40 (-eV)  
99+
Lattice Constant
514.80 pm  
15
408.53 pm  
23
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
99+
1.59  
26
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
10.49 g/cm3  
37
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
9.32 g/cm3  
99+
Tensile Strength
40.00 MPa  
99+
170.00 MPa  
21
Viscosity
0.00  
2
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
14
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
30.00 GPa  
27
Bulk Modulus
43.00 GPa  
33
100.00 GPa  
16
Young's Modulus
83.00 GPa  
25
83.00 GPa  
25
Poisson Ratio
0.31  
13
0.37  
7
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
10.50  
39
Magnetic Ordering
Nonmagnetic  
Diamagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
18
0.00  
32
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
100.00 nΩ·m  
31
15.87 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.63 106/cm Ω  
1
Electron Affinity
0.90 kJ/mol  
99+
125.60 kJ/mol  
5
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.24 J/(kg K)  
25
Molar Heat Capacity
20.05 J/mol·K  
99+
25.35 J/mol·K  
99+
Thermal Conductivity
18.60 W/m·K  
99+
429.00 W/m·K  
1
Critical Temperature
973.00 K  
99+
1,235.00 K  
99+
Thermal Expansion
8.50 µm/(m·K)  
99+
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
255.10 kJ/mol  
99+
Enthalpy of Fusion
8.60 kJ/mol  
99+
11.30 kJ/mol  
37
Enthalpy of Atomization
163.00 kJ/mol  
99+
284.50 kJ/mol  
99+
Standard Molar Entropy
71.00 J/mol.K  
14
42.60 J/mol.K  
99+
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