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Radium vs Strontium

Radium
Strontium
Strontium vs Radium


Periodic Table
Symbol
Ra   
Sr   
Group Number
2   
16
2   
16
Period Number
7   
5   
Block
s block   
s block   
Element Family
Alkaline Earth   
Alkaline Earth   
CAS Number
7440144   
99+
7440246   
99+
Space Group Name
Im_ 3m   
Fm_ 3m   
Space Group Number
229.00   
1
225.00   
2
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.
  
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
Sources
Mining, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Not Available   
William Cruickshank   
Discovery
In 1898   
In 1787   
Abundance
  
  
Abundance In Universe
Not Available   
4 * 10-6 %   
14
Abundance In Sun
~-9999 %   
~0.000005 %   
15
Abundance In Meteorites
Not Available   
0.00 %   
15
Abundance In Earth's Crust
0.00 %   
99+
0.04 %   
10
Abundance In Oceans
0.00 %   
99+
0.00 %   
4
Abundance In Humans
0.00 %   
20
0.00 %   
7
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.
  
  • 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.
  
Industrial Uses
NA   
Ammunition Industry, Chemical Industry   
Medical Uses
Pharmaceutical Industry   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.03 Blood/mg dm-3   
19
In Bone
Not Available   
140.00 p.p.m.   
7
Physical Properties
Melting Point
700.00 °C   
99+
769.00 °C   
99+
Boiling Point
1,737.00 °C   
99+
1,384.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
1.50   
18
Speed of Sound
Not Available   
Not Available   
Optical Properties
  
  
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
Ra   
Sr   
Isotopes
  
  
Known Isotopes
33   
6
27   
12
Electronegativity
  
  
Pauling Electronegativity
0.90   
99+
0.95   
99+
Sanderson Electronegativity
Not Available   
0.72   
27
Allred Rochow Electronegativity
0.97   
38
0.99   
37
Mulliken-Jaffe Electronegativity
0.92   
20
1.00   
18
Allen Electronegativity
0.89   
99+
0.96   
40
Electropositivity
  
  
Pauling Electropositivity
3.10   
5
3.05   
7
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol   
99+
549.50 kJ/mol   
99+
2nd Energy Level
979.00 kJ/mol   
99+
1,064.20 kJ/mol   
99+
3rd Energy Level
Not Available   
4,138.00 kJ/mol   
10
4th Energy Level
Not Available   
5,500.00 kJ/mol   
13
5th Energy Level
Not Available   
6,910.00 kJ/mol   
18
6th Energy Level
Not Available   
8,760.00 kJ/mol   
18
7th Energy level
Not Available   
10,230.00 kJ/mol   
19
8th Energy Level
Not Available   
11,800.00 kJ/mol   
19
9th Energy Level
Not Available   
15,600.00 kJ/mol   
17
10th Energy Level
Not Available   
17,100.00 kJ/mol   
19
11th Energy Level
Not Available   
31,270.00 kJ/mol   
6
Electrochemical Equivalent
4.22 g/amp-hr   
6
1.64 g/amp-hr   
99+
Electron Work Function
Not Available   
2.59 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
88   
30
38   
99+
Electron Configuration
[Rn] 7s2   
[Kr] 5s2   
Crystal Structure
Body Centered Cubic (BCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Strontium.jpg#100   
Atom
  
  
Number of Protons
88   
30
38   
99+
Number of Neutrons
138   
16
50   
99+
Number of Electrons
88   
30
38   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
215.00 pm   
5
Covalent Radius
221.00 pm   
3
195.00 pm   
15
Van der Waals Radius
283.00 pm   
4
249.00 pm   
7
Atomic Weight
226.00 amu   
26
87.62 amu   
99+
Atomic Volume
45.20 cm3/mol   
4
33.70 cm3/mol   
6
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Rubidium
  
Next Element
Actinium
  
Yttrium
  
Valence Electron Potential
20.10 (-eV)   
99+
25.70 (-eV)   
99+
Lattice Constant
514.80 pm   
13
608.49 pm   
6
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
5.50 g/cm3   
99+
2.64 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
2.38 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
121.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
Not Available   
6.03 GPa   
99+
Young's Modulus
Not Available   
15.70 GPa   
99+
Poisson Ratio
Not Available   
0.28   
17
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
5.00   
99+
2.64   
99+
Magnetic Ordering
Nonmagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
NA   
NA   
Resistivity
100.00 nΩ·m   
31
132.00 nΩ·m   
24
Electrical Conductivity
Not Available   
0.08 106/cm Ω   
26
Electron Affinity
Not Available   
5.03 kJ/mol   
38
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.30 J/(kg K)   
18
Molar Heat Capacity
Not Available   
26.40 J/mol·K   
28
Thermal Conductivity
18.60 W/m·K   
99+
35.40 W/m·K   
37
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
22.50 µm/(m·K)   
18
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
150.00 kJ/mol   
99+
Enthalpy of Fusion
Not Available   
9.16 kJ/mol   
38
Enthalpy of Atomization
163.00 kJ/mol   
99+
163.20 kJ/mol   
99+
Standard Molar Entropy
71.00 J/mol.K   
14
55.00 J/mol.K   
26
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