Symbol
Ba
  
Ga
  
Period Number
6
  
4
  
Block
s block
  
p block
  
Element Family
Alkaline Earth
  
Post-Transition
  
Space Group Name
Im_ 3m
  
Cmca
  
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.
  
- A gram of Gallium metal can be bought for only three dollars.
- Gallium metal found in ores of following things Coal, Bauxite, Diaspore, Sphalerite, Germanite and Zinc.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals
  
Earth's crust, Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Carl Wilhelm Scheele
  
Lecoq de Boisbaudran
  
Discovery
In 1772
  
In 1875
  
Abundance
  
  
Abundance In Sun
~0.000001 %
  
18
~0.000004 %
  
16
Abundance In Earth's Crust
Abundance In Humans
Not Available
  
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.
  
- Gallium arsenide is a very important component of many semiconductors and led manufacturing.
- Gallium nitride is also know as a semiconductor and it is used in Blu-ray technology, mobile smartphones and LED.
  
Industrial Uses
Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry
  
Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
Surgical Instruments Manufacturing
  
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
0.08 Blood/mg dm-3
  
13
In Bone
70.00 p.p.m.
  
9
Not Available
  
Boiling Point
1,140.00 °C
  
99+
2,403.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Gray
  
Silvery White
  
Luster
NA
  
Metallic
  
Hardness
  
  
Brinell Hardness
Not Available
  
Speed of Sound
1,620.00 m/s
  
99+
2,740.00 m/s
  
31
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Ba
  
Ga
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
502.90 kJ/mol
  
99+
578.80 kJ/mol
  
99+
2nd Energy Level
965.20 kJ/mol
  
99+
1,979.30 kJ/mol
  
13
3rd Energy Level
3,600.00 kJ/mol
  
14
2,963.00 kJ/mol
  
28
4th Energy Level
Not Available
  
6,180.00 kJ/mol
  
8
Electrochemical Equivalent
2.56 g/amp-hr
  
20
0.87 g/amp-hr
  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Ionization, Radioactive Isotopes
  
Electron Configuration
[Xe] 6s2
  
[Ar] 3d10 4s2 4p1
  
Crystal Structure
Body Centered Cubic (BCC)
  
Orthorhombic (ORTH)
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
ORTH-Crystal-Structure-of-Gallium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Weight
137.33 amu
  
99+
Atomic Volume
39.24 cm3/mol
  
5
11.80 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
21.30 (-eV)
  
99+
69.70 (-eV)
  
19
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
3.51 g/cm3
  
99+
5.91 g/cm3
  
99+
Density When Liquid (at m.p.)
3.34 g/cm3
  
99+
6.10 g/cm3
  
99+
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Superconductor
  
Semiconductor
  
Resistivity
332.00 nΩ·m
  
13
270.00 nΩ·m
  
15
Electrical Conductivity
0.03 106/cm Ω
  
40
0.07 106/cm Ω
  
29
Electron Affinity
13.95 kJ/mol
  
36
28.90 kJ/mol
  
31
Specific Heat
0.20 J/(kg K)
  
30
0.37 J/(kg K)
  
16
Molar Heat Capacity
28.07 J/mol·K
  
12
25.86 J/mol·K
  
35
Thermal Conductivity
18.40 W/m·K
  
99+
40.60 W/m·K
  
34
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
20.60 µm/(m·K)
  
22
18.00 µm/(m·K)
  
24
Enthalpy
  
  
Enthalpy of Vaporization
140.00 kJ/mol
  
99+
256.10 kJ/mol
  
36
Enthalpy of Fusion
7.66 kJ/mol
  
99+
5.59 kJ/mol
  
99+
Enthalpy of Atomization
175.70 kJ/mol
  
99+
276.10 kJ/mol
  
39
Standard Molar Entropy
62.50 J/mol.K
  
20
40.80 J/mol.K
  
38