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Calcium vs Polonium

Calcium
Polonium
Polonium vs Calcium


Periodic Table
Symbol
Ca   
Po   
Group Number
2   
16
16   
2
Period Number
4   
6   
Block
s block   
p block   
Element Family
Alkaline Earth   
Post-​Transition   
CAS Number
7440702   
21
7440086   
99+
Space Group Name
Fm_ 3m   
Pm-3m   
Space Group Number
225.00   
2
221.00   
3
Facts
Interesting Facts
  • Calcium ranks 5th rank in the list of earth’s abundance Percentage.
  • It is found in the compound state.
  • Gypsum or calcium sulfate is used as plaster and plaster of paris.
  
  • 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
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
Mining, Ores of metals   
History
  
  
Who Discovered
Humphry Davy   
Pierre Curie and Marie Curie   
Discovery
In 1808   
In 1898   
Abundance
  
  
Abundance In Universe
7 * 10-3 %   
3
Not Available   
Abundance In Sun
~0.007 %   
4
~-9999 %   
Abundance In Meteorites
1.10 %   
4
Not Available   
Abundance In Earth's Crust
5.00 %   
3
Not Available   
Abundance In Oceans
0.00 %   
5
0.00 %   
99+
Abundance In Humans
1.40 %   
1
Not Available   
Uses
Uses & Benefits
  • It is used as a reducing agent while preparing metals like thorium and uranium. It is also used as an alloying agent for metals such as aluminum, copper & lead.
  • Calcium carbonate or lime stone is used in cement.
  
  • 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
Chemical Industry   
Aerospace Industry, Ammunition Industry   
Medical Uses
Dentistry, Pharmaceutical Industry   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
Highly Toxic   
Present in Human Body
Yes   
No   
In Blood
60.50 Blood/mg dm-3   
4
0.00 Blood/mg dm-3   
37
In Bone
170,000.00 p.p.m.   
1
0.00 p.p.m.   
36
Physical Properties
Melting Point
839.00 °C   
99+
254.00 °C   
99+
Boiling Point
1,484.00 °C   
99+
962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silver   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
1.75   
17
Not Available   
Brinell Hardness
170.00 MPa   
99+
Not Available   
Speed of Sound
3,810.00 m/s   
19
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
Ca   
Po   
Isotopes
  
  
Known Isotopes
19   
20
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.00   
99+
2.00   
7
Sanderson Electronegativity
0.95   
24
Not Available   
Allred Rochow Electronegativity
1.04   
34
1.76   
2
Mulliken-Jaffe Electronegativity
1.08   
17
2.48   
1
Allen Electronegativity
1.03   
39
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
3.00   
9
2.00   
99+
Ionization Energies
  
  
1st Energy Level
589.80 kJ/mol   
99+
812.10 kJ/mol   
14
2nd Energy Level
1,145.40 kJ/mol   
99+
Not Available   
3rd Energy Level
4,912.40 kJ/mol   
7
Not Available   
4th Energy Level
6,491.00 kJ/mol   
7
Not Available   
5th Energy Level
8,153.00 kJ/mol   
7
Not Available   
6th Energy Level
10,496.00 kJ/mol   
8
Not Available   
7th Energy level
12,270.00 kJ/mol   
12
Not Available   
8th Energy Level
14,206.00 kJ/mol   
15
Not Available   
9th Energy Level
18,191.00 kJ/mol   
12
Not Available   
10th Energy Level
20,385.00 kJ/mol   
16
Not Available   
11th Energy Level
57,110.00 kJ/mol   
3
Not Available   
12th Energy Level
63,410.00 kJ/mol   
3
Not Available   
13th Energy Level
70,110.00 kJ/mol   
3
Not Available   
14th Energy Level
78,890.00 kJ/mol   
4
Not Available   
15th Energy Level
86,310.00 kJ/mol   
5
Not Available   
16th Energy Level
94,000.00 kJ/mol   
6
Not Available   
17th Energy Level
104,900.00 kJ/mol   
7
Not Available   
18th Energy Level
111,711.00 kJ/mol   
8
Not Available   
Electrochemical Equivalent
0.75 g/amp-hr   
99+
3.90 g/amp-hr   
8
Electron Work Function
2.87 eV   
38
Not Available   
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
20   
99+
84   
32
Electron Configuration
[Ar] 4s2   
[Xe] 4f14 5d10 6s2 6p4   
Crystal Structure
Face Centered Cubic (FCC)   
Monoclinic (MON)   
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Atom
  
  
Number of Protons
20   
99+
84   
32
Number of Neutrons
20   
99+
125   
19
Number of Electrons
20   
99+
84   
32
Radius of an Atom
  
  
Atomic Radius
197.00 pm   
6
168.00 pm   
23
Covalent Radius
176.00 pm   
22
140.00 pm   
99+
Van der Waals Radius
231.00 pm   
19
197.00 pm   
29
Atomic Weight
40.08 amu   
99+
209.00 amu   
28
Atomic Volume
29.90 cm3/mol   
7
22.23 cm3/mol   
13
Adjacent Atomic Numbers
  
  
Previous Element
Potassium
  
Bismuth
  
Next Element
Scandium
  
Francium
  
Valence Electron Potential
29.00 (-eV)   
99+
Not Available   
Lattice Constant
558.84 pm   
9
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
1.55 g/cm3   
99+
9.20 g/cm3   
99+
Density When Liquid (at m.p.)
1.38 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
25.50 (Pa)   
3
Not Available   
Elasticity properties
  
  
Shear Modulus
7.40 GPa   
99+
Not Available   
Bulk Modulus
17.00 GPa   
99+
Not Available   
Young's Modulus
20.00 GPa   
99+
Not Available   
Poisson Ratio
0.31   
13
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
4.58   
99+
9.32   
31
Magnetic Ordering
Diamagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
33.60 nΩ·m   
99+
0.40 nΩ·m   
99+
Electrical Conductivity
0.30 106/cm Ω   
6
0.02 106/cm Ω   
99+
Electron Affinity
2.37 kJ/mol   
39
183.30 kJ/mol   
3
Thermal Properties
Specific Heat
0.63 J/(kg K)   
7
0.12 J/(kg K)   
40
Molar Heat Capacity
25.93 J/mol·K   
34
26.40 J/mol·K   
28
Thermal Conductivity
201.00 W/m·K   
5
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
22.30 µm/(m·K)   
19
23.50 µm/(m·K)   
16
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol   
99+
60.30 kJ/mol   
99+
Enthalpy of Fusion
8.54 kJ/mol   
99+
13.00 kJ/mol   
26
Enthalpy of Atomization
184.00 kJ/mol   
99+
134.00 kJ/mol   
99+
Standard Molar Entropy
41.60 J/mol.K   
36
Not Available   
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