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Strontium Radium Comparison


Radium Strontium comparison


Periodic Table

Symbol
Sr   
Ra   

Group Number
2   
16
2   
16

Period Number
5   
7   

Block
s block   
s block   

Element Family
Alkaline Earth   
Alkaline Earth   

CAS Number
7440246   
99+
7440144   
99+

Space Group Name
Fm_ 3m   
Im_ 3m   

Space Group Number
225.00   
2
229.00   
1

Facts

Interesting Facts
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  

Sources
Found in Minerals, Mining, Ores of Minerals   
Mining, Ores of metals   

History
  
  

Who Discovered
William Cruickshank   
Not Available   

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
0.00 %   
99+

Abundance In Oceans
0.00 %   
4
0.00 %   
99+

Abundance In Humans
0.00 %   
7
0.00 %   
20

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.
  
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  

Industrial Uses
Ammunition Industry, Chemical Industry   
NA   

Medical Uses
NA   
Pharmaceutical Industry   

Other Uses
Alloys   
NA   

Biological Properties
  
  

Toxicity
Non Toxic   
Highly Toxic   

Present in Human Body
Yes   
No   

In Blood
0.03 Blood/mg dm-3   
19
Not Available   

In Bone
140.00 p.p.m.   
7
Not Available   

Physical Properties

Melting Point
769.00 °C   
99+
700.00 °C   
99+

Boiling Point
1,384.00 °C   
99+
1,737.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery White   
Silvery White   

Luster
Metallic   
Metallic   

Hardness
  
  

Mohs Hardness
1.50   
18
Not Available   

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
Sr   
Ra   

Isotopes
  
  

Known Isotopes
27   
12
33   
6

Electronegativity
  
  

Pauling Electronegativity
0.95   
99+
0.90   
99+

Sanderson Electronegativity
0.72   
27
Not Available   

Allred Rochow Electronegativity
0.99   
37
0.97   
38

Mulliken-Jaffe Electronegativity
1.00   
18
0.92   
20

Allen Electronegativity
0.96   
40
0.89   
99+

Electropositivity
  
  

Pauling Electropositivity
3.05   
7
3.10   
5

Ionization Energies
  
  

1st Energy Level
549.50 kJ/mol   
99+
509.30 kJ/mol   
99+

2nd Energy Level
1,064.20 kJ/mol   
99+
979.00 kJ/mol   
99+

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+
4.22 g/amp-hr   
6

Electron Work Function
2.59 eV   
99+
Not Available   

Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   

Atomic Properties

Atomic Number
38   
99+
88   
30

Electron Configuration
[Kr] 5s2   
[Rn] 7s2   

Crystal Structure
Face Centered Cubic (FCC)   
Body Centered Cubic (BCC)   

Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
38   
99+
88   
30

Number of Neutrons
50   
99+
138   
16

Number of Electrons
38   
99+
88   
30

Radius of an Atom
  
  

Atomic Radius
215.00 pm   
5
Not Available   

Covalent Radius
195.00 pm   
15
221.00 pm   
3

Van der Waals Radius
249.00 pm   
7
283.00 pm   
4

Atomic Weight
87.62 amu   
99+
226.00 amu   
26

Atomic Volume
33.70 cm3/mol   
6
45.20 cm3/mol   
4

Adjacent Atomic Numbers
  
  

Previous Element
Rubidium
  
Francium
  

Next Element
Yttrium
  
Actinium
  

Valence Electron Potential
25.70 (-eV)   
99+
20.10 (-eV)   
99+

Lattice Constant
608.49 pm   
6
514.80 pm   
13

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+
5.50 g/cm3   
99+

Density When Liquid (at m.p.)
2.38 g/cm3   
99+
Not Available   

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+
5.00   
99+

Magnetic Ordering
Paramagnetic   
Nonmagnetic   

Electrical Properties
  
  

Electrical Property
NA   
NA   

Resistivity
132.00 nΩ·m   
24
100.00 nΩ·m   
31

Electrical Conductivity
0.08 106/cm Ω   
26
Not Available   

Electron Affinity
5.03 kJ/mol   
38
Not Available   

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
Not Available   

Thermal Conductivity
35.40 W/m·K   
37
18.60 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
22.50 µm/(m·K)   
18
Not Available   

Enthalpy
  
  

Enthalpy of Vaporization
150.00 kJ/mol   
99+
Not Available   

Enthalpy of Fusion
9.16 kJ/mol   
38
Not Available   

Enthalpy of Atomization
163.20 kJ/mol   
99+
163.00 kJ/mol   
99+

Standard Molar Entropy
55.00 J/mol.K   
26
71.00 J/mol.K   
14

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