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Strontium vs Polonium

Strontium
Polonium
Polonium vs Strontium


Periodic Table
Symbol
Sr  
Po  
Group Number
2  
16
16  
2
Period Number
5  
6  
Block
s block  
p block  
Element Family
Alkaline Earth  
Post-​Transition  
CAS Number
7440246  
99+
7440086  
99+
Space Group Name
Fm_ 3m  
Pm-3m  
Space Group Number
225.00  
2
221.00  
3
Facts
Interesting Facts
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
  • Polonium was the first radioactive element to be discovered.
  • Polonium element and its compounds are highly radioactive.
  • Its alloy with Beryllium provides source of neutrons.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Mining, Ores of metals  
History
  
  
Who Discovered
William Cruickshank  
Pierre Curie and Marie Curie  
Discovery
In 1787  
In 1898  
Abundance
  
  
Abundance In Universe
4 * 10-6 %  
14
Not Available  
Abundance In Sun
~0.000005 %  
15
~-9999 %  
Abundance In Meteorites
0.00 %  
15
Not Available  
Abundance In Earth's Crust
0.04 %  
10
Not Available  
Abundance In Oceans
0.00 %  
4
0.00 %  
99+
Abundance In Humans
0.00 %  
7
Not Available  
Uses
Uses & Benefits
  • Strontium metal is used to producing ferrite magnets as well as refining zinc.
  • By-product of nuclear reactors called Strontium-90 is a radioactive isotope; it is absorbed by tissues and destroys bone marrow and cancer growth.
  
  • Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
  • A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
  
Industrial Uses
Ammunition Industry, Chemical Industry  
Aerospace Industry, Ammunition Industry  
Medical Uses
NA  
NA  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
Highly Toxic  
Present in Human Body
Yes  
No  
In Blood
0.03 Blood/mg dm-3  
19
0.00 Blood/mg dm-3  
37
In Bone
140.00 p.p.m.  
7
0.00 p.p.m.  
36
Physical Properties
Melting Point
769.00 °C  
99+
254.00 °C  
99+
Boiling Point
1,384.00 °C  
99+
962.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
NA  
Hardness
  
  
Mohs Hardness
1.50  
18
Not Available  
Speed of Sound
Not Available  
Not Available  
Optical Properties
  
  
Allotropes
No  
Yes  
α Allotropes
Not Available  
α-polonium  
β Allotropes
Not Available  
β-polonium  
γ Allotropes
Not Available  
Not Available  
Chemical Properties
Chemical Formula
Sr  
Po  
Isotopes
  
  
Known Isotopes
27  
12
29  
10
Electronegativity
  
  
Pauling Electronegativity
0.95  
99+
2.00  
7
Sanderson Electronegativity
0.72  
27
Not Available  
Allred Rochow Electronegativity
0.99  
37
1.76  
2
Mulliken-Jaffe Electronegativity
1.00  
18
2.48  
1
Allen Electronegativity
0.96  
40
2.19  
2
Electropositivity
  
  
Pauling Electropositivity
3.05  
7
2.00  
99+
Ionization Energies
  
  
1st Energy Level
549.50 kJ/mol  
99+
812.10 kJ/mol  
14
2nd Energy Level
1,064.20 kJ/mol  
99+
Not Available  
3rd Energy Level
4,138.00 kJ/mol  
10
Not Available  
4th Energy Level
5,500.00 kJ/mol  
13
Not Available  
5th Energy Level
6,910.00 kJ/mol  
18
Not Available  
6th Energy Level
8,760.00 kJ/mol  
18
Not Available  
7th Energy level
10,230.00 kJ/mol  
19
Not Available  
8th Energy Level
11,800.00 kJ/mol  
19
Not Available  
9th Energy Level
15,600.00 kJ/mol  
17
Not Available  
10th Energy Level
17,100.00 kJ/mol  
19
Not Available  
11th Energy Level
31,270.00 kJ/mol  
6
Not Available  
Electrochemical Equivalent
1.64 g/amp-hr  
99+
3.90 g/amp-hr  
8
Electron Work Function
2.59 eV  
99+
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
38  
99+
84  
32
Electron Configuration
[Kr] 5s2  
[Xe] 4f14 5d10 6s2 6p4  
Crystal Structure
Face Centered Cubic (FCC)  
Monoclinic (MON)  
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100  
MON-Crystal-Structure-of-Polonium.jpg#100  
Atom
  
  
Number of Protons
38  
99+
84  
32
Number of Neutrons
50  
99+
125  
19
Number of Electrons
38  
99+
84  
32
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
5
168.00 pm  
23
Covalent Radius
195.00 pm  
15
140.00 pm  
99+
Van der Waals Radius
249.00 pm  
7
197.00 pm  
29
Atomic Weight
87.62 amu  
99+
209.00 amu  
28
Atomic Volume
33.70 cm3/mol  
6
22.23 cm3/mol  
13
Adjacent Atomic Numbers
  
  
Previous Element
Rubidium
  
Bismuth
  
Next Element
Yttrium
  
Francium
  
Valence Electron Potential
25.70 (-eV)  
99+
Not Available  
Lattice Constant
608.49 pm  
6
335.90 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
Not Available  
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
2.64 g/cm3  
99+
9.20 g/cm3  
99+
Density When Liquid (at m.p.)
2.38 g/cm3  
99+
9.40 g/cm3  
19
Tensile Strength
Not Available  
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
121.00 (Pa)  
1
Not Available  
Elasticity properties
  
  
Shear Modulus
6.03 GPa  
99+
Not Available  
Young's Modulus
15.70 GPa  
99+
Not Available  
Poisson Ratio
0.28  
17
Not Available  
Other Mechanical Properties
NA  
NA  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
2.64  
99+
9.32  
31
Magnetic Ordering
Paramagnetic  
Nonmagnetic  
Electrical Properties
  
  
Electrical Property
NA  
Conductor  
Resistivity
132.00 nΩ·m  
24
0.40 nΩ·m  
99+
Electrical Conductivity
0.08 106/cm Ω  
26
0.02 106/cm Ω  
99+
Electron Affinity
5.03 kJ/mol  
38
183.30 kJ/mol  
3
Thermal Properties
Specific Heat
0.30 J/(kg K)  
18
0.12 J/(kg K)  
40
Molar Heat Capacity
26.40 J/mol·K  
28
26.40 J/mol·K  
28
Thermal Conductivity
35.40 W/m·K  
37
20.00 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
22.50 µm/(m·K)  
18
23.50 µm/(m·K)  
16
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol  
99+
60.30 kJ/mol  
99+
Enthalpy of Fusion
9.16 kJ/mol  
38
13.00 kJ/mol  
26
Enthalpy of Atomization
163.20 kJ/mol  
99+
134.00 kJ/mol  
99+
Standard Molar Entropy
55.00 J/mol.K  
26
Not Available  
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