Gallium Strontium Comparison
Periodic Table
Symbol
Ga
Sr
Group Number
13
5
2
16
Period Number
4
5
Block
p block
s block
Element Family
Post-Transition
Alkaline Earth
CAS Number
7440553
32
7440246
99+
Space Group Name
Cmca
Fm_ 3m
Space Group Number
64.00
9
225.00
2
Facts
Interesting Facts
- 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.
- 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
Lecoq de Boisbaudran
William Cruickshank
Discovery
In 1875
In 1787
Abundance
Abundance In Universe
1 * 10-6 %
16
4 * 10-6 %
14
Abundance In Sun
~0.000004 %
16
~0.000005 %
15
Abundance In Meteorites
0.00 %
16
0.00 %
15
Abundance In Earth's Crust
0.00 %
24
0.04 %
10
Abundance In Oceans
0.00 %
22
0.00 %
4
Abundance In Humans
Not Available
0.00 %
7
Uses
Uses & Benefits
- 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.
- 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
Electrical Industry, Electronic Industry
Ammunition Industry, Chemical Industry
Medical Uses
Surgical Instruments Manufacturing
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Non Toxic
Non Toxic
Present in Human Body
Yes
Yes
In Blood
0.08 Blood/mg dm-3
13
0.03 Blood/mg dm-3
19
In Bone
Not Available
140.00 p.p.m.
7
Physical Properties
Melting Point
29.78 °C
99+
769.00 °C
99+
Boiling Point
2,403.00 °C
99+
1,384.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
1.50
18
1.50
18
Brinell Hardness
56.80 MPa
99+
Not Available
Speed of Sound
2,740.00 m/s
31
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
Ga
Sr
Isotopes
Known Isotopes
24
15
27
12
Electronegativity
Pauling Electronegativity
1.81
15
0.95
99+
Sanderson Electronegativity
2.42
2
0.72
27
Allred Rochow Electronegativity
1.82
1
0.99
37
Mulliken-Jaffe Electronegativity
2.01
5
1.00
18
Allen Electronegativity
1.76
14
0.96
40
Electropositivity
Pauling Electropositivity
2.19
39
3.05
7
Ionization Energies
1st Energy Level
578.80 kJ/mol
99+
549.50 kJ/mol
99+
2nd Energy Level
1,979.30 kJ/mol
13
1,064.20 kJ/mol
99+
3rd Energy Level
2,963.00 kJ/mol
28
4,138.00 kJ/mol
10
4th Energy Level
6,180.00 kJ/mol
8
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
0.87 g/amp-hr
99+
1.64 g/amp-hr
99+
Electron Work Function
4.20 eV
23
2.59 eV
99+
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
31
99+
38
99+
Electron Configuration
[Ar] 3d10 4s2 4p1
[Kr] 5s2
Crystal Structure
Orthorhombic (ORTH)
Face Centered Cubic (FCC)
Crystal Lattice
ORTH-Crystal-Structure-of-Gallium.jpg#100
FCC-Crystal-Structure-of-Strontium.jpg#100
Atom
Number of Protons
31
99+
38
99+
Number of Neutrons
39
99+
50
99+
Number of Electrons
31
99+
38
99+
Radius of an Atom
Atomic Radius
135.00 pm
99+
215.00 pm
5
Covalent Radius
122.00 pm
99+
195.00 pm
15
Van der Waals Radius
187.00 pm
32
249.00 pm
7
Atomic Weight
69.72 amu
99+
87.62 amu
99+
Atomic Volume
11.80 cm3/mol
99+
33.70 cm3/mol
6
Adjacent Atomic Numbers
Valence Electron Potential
69.70 (-eV)
19
25.70 (-eV)
99+
Lattice Constant
451.97 pm
18
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
5.91 g/cm3
99+
2.64 g/cm3
99+
Density When Liquid (at m.p.)
6.10 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
0.00 (Pa)
15
121.00 (Pa)
1
Elasticity properties
Shear Modulus
Not Available
6.03 GPa
99+
Young's Modulus
9.80 GPa
99+
15.70 GPa
99+
Poisson Ratio
0.47
1
0.28
17
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
5.91
99+
2.64
99+
Magnetic Ordering
Diamagnetic
Paramagnetic
Electrical Properties
Electrical Property
Semiconductor
NA
Resistivity
270.00 nΩ·m
15
132.00 nΩ·m
24
Electrical Conductivity
0.07 106/cm Ω
29
0.08 106/cm Ω
26
Electron Affinity
28.90 kJ/mol
31
5.03 kJ/mol
38
Thermal Properties
Specific Heat
0.37 J/(kg K)
16
0.30 J/(kg K)
18
Molar Heat Capacity
25.86 J/mol·K
35
26.40 J/mol·K
28
Thermal Conductivity
40.60 W/m·K
34
35.40 W/m·K
37
Critical Temperature
Not Available
Not Available
Thermal Expansion
18.00 µm/(m·K)
24
22.50 µm/(m·K)
18
Enthalpy
Enthalpy of Vaporization
256.10 kJ/mol
36
150.00 kJ/mol
99+
Enthalpy of Fusion
5.59 kJ/mol
99+
9.16 kJ/mol
38
Enthalpy of Atomization
276.10 kJ/mol
39
163.20 kJ/mol
99+
Standard Molar Entropy
40.80 J/mol.K
38
55.00 J/mol.K
26
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