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Barium vs Strontium


Strontium vs Barium


Periodic Table

Symbol
Ba   
Sr   

Group Number
2   
16
2   
16

Period Number
6   
5   

Block
s block   
s block   

Element Family
Alkaline Earth   
Alkaline Earth   

CAS Number
7440393   
99+
7440246   
99+

Space Group Name
Im_ 3m   
Fm_ 3m   

Space Group Number
229.00   
1
225.00   
2

Facts

Interesting Facts
  • Barium oxidizes very easily in the air.
  • All toxic compounds of Barium can easily dissolve in water.
  • Barium carbonate is used to produce a Rat poison and its other compound Barium nitrate is used in fireworks to produce green color.
  
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  

Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Carl Wilhelm Scheele   
William Cruickshank   

Discovery
In 1772   
In 1787   

Abundance
  
  

Abundance In Universe
1 * 10-6 %   
16
4 * 10-6 %   
14

Abundance In Sun
~0.000001 %   
18
~0.000005 %   
15

Abundance In Meteorites
0.00 %   
20
0.00 %   
15

Abundance In Earth's Crust
0.03 %   
11
0.04 %   
10

Abundance In Oceans
0.00 %   
8
0.00 %   
4

Abundance In Humans
0.00 %   
12
0.00 %   
7

Uses

Uses & Benefits
  • It is sued in chemical paint manufacturing and glass manufacturing.
  • Compounds of this metal are toxic; but still the barium sulfate is insoluble and given to patients suffering from digestive disorder.
  
  • 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
Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Ammunition Industry, Chemical Industry   

Medical Uses
NA   
NA   

Other Uses
Alloys   
Alloys   

Biological Properties
  
  

Toxicity
Low Toxic   
Non Toxic   

Present in Human Body
Yes   
Yes   

In Blood
0.07 Blood/mg dm-3   
15
0.03 Blood/mg dm-3   
19

In Bone
70.00 p.p.m.   
9
140.00 p.p.m.   
7

Physical Properties

Melting Point
725.00 °C   
99+
769.00 °C   
99+

Boiling Point
1,140.00 °C   
99+
1,384.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery Gray   
Silvery White   

Luster
NA   
Metallic   

Hardness
  
  

Mohs Hardness
1.25   
19
1.50   
18

Speed of Sound
1,620.00 m/s   
99+
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
Ba   
Sr   

Isotopes
  
  

Known Isotopes
37   
2
27   
12

Electronegativity
  
  

Pauling Electronegativity
0.89   
99+
0.95   
99+

Sanderson Electronegativity
0.68   
28
0.72   
27

Allred Rochow Electronegativity
0.97   
38
0.99   
37

Mulliken-Jaffe Electronegativity
0.88   
22
1.00   
18

Allen Electronegativity
0.88   
99+
0.96   
40

Electropositivity
  
  

Pauling Electropositivity
3.11   
4
3.05   
7

Ionization Energies
  
  

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

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

3rd Energy Level
3,600.00 kJ/mol   
14
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
2.56 g/amp-hr   
20
1.64 g/amp-hr   
99+

Electron Work Function
2.70 eV   
99+
2.59 eV   
99+

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

Atomic Properties

Atomic Number
56   
99+
38   
99+

Electron Configuration
[Xe] 6s2   
[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
56   
99+
38   
99+

Number of Neutrons
81   
99+
50   
99+

Number of Electrons
56   
99+
38   
99+

Radius of an Atom
  
  

Atomic Radius
222.00 pm   
4
215.00 pm   
5

Covalent Radius
215.00 pm   
5
195.00 pm   
15

Van der Waals Radius
268.00 pm   
6
249.00 pm   
7

Atomic Weight
137.33 amu   
99+
87.62 amu   
99+

Atomic Volume
39.24 cm3/mol   
5
33.70 cm3/mol   
6

Adjacent Atomic Numbers
  
  

Previous Element
Cesium
  
Rubidium
  

Next Element
Lanthanum
  
Yttrium
  

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

Lattice Constant
502.80 pm   
15
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
3.51 g/cm3   
99+
2.64 g/cm3   
99+

Density When Liquid (at m.p.)
3.34 g/cm3   
99+
2.38 g/cm3   
99+

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 1000 K
7.11 (Pa)   
6
121.00 (Pa)   
1

Elasticity properties
  
  

Shear Modulus
4.90 GPa   
99+
6.03 GPa   
99+

Bulk Modulus
9.60 GPa   
99+
Not Available   

Young's Modulus
13.00 GPa   
99+
15.70 GPa   
99+

Poisson Ratio
Not Available   
0.28   
17

Other Mechanical Properties
NA   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
3.62   
99+
2.64   
99+

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Superconductor   
NA   

Resistivity
332.00 nΩ·m   
13
132.00 nΩ·m   
24

Electrical Conductivity
0.03 106/cm Ω   
40
0.08 106/cm Ω   
26

Electron Affinity
13.95 kJ/mol   
36
5.03 kJ/mol   
38

Thermal Properties

Specific Heat
0.20 J/(kg K)   
30
0.30 J/(kg K)   
18

Molar Heat Capacity
28.07 J/mol·K   
12
26.40 J/mol·K   
28

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

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
20.60 µm/(m·K)   
22
22.50 µm/(m·K)   
18

Enthalpy
  
  

Enthalpy of Vaporization
140.00 kJ/mol   
99+
150.00 kJ/mol   
99+

Enthalpy of Fusion
7.66 kJ/mol   
99+
9.16 kJ/mol   
38

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

Standard Molar Entropy
62.50 J/mol.K   
20
55.00 J/mol.K   
26

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