Symbol
Mg
Hf
Group Number
24
0
17
👆🏻
Period Number
36
2
7
👆🏻
Block
s block
d block
Element Family
Alkaline Earth
Transition Metal
CAS Number
74399547440586
7429905
54386242
👆🏻
Space Group Name
P63/mmc
P63/mmc
Space Group Number
194.00194.00
11
276
👆🏻
Interesting Facts
- Magnesium ions are present in every chlorophyll of every green plant .
- Controlling Magnesium fire by pouring water on it will result in explosions.
- Hafnium metal is highly reactive, hence not found free in nature.
- Hafnium metal as predicated after Mendeleev finished his periodic table.
Sources
By Electrolysis Process, In Ocean, Mining
By-product Zirconium Refining
History
Who Discovered
Joseph Black
Dirk Coster and George de Hevesy
Discovery
In 1755
In 1922
Abundance
Abundance In Universe
0.06 %0.00 %
0
0.11
👆🏻
Abundance In Sun
0.07 %0.00 %
0
0.1
👆🏻
Abundance In Meteorites
12.00 %0.00 %
0
22
👆🏻
Abundance In Earth's Crust
2.90 %0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
0.13 %0.00 %
0
1.1
👆🏻
Abundance In Humans
0.03 %0.00 %
0
1.4
👆🏻
Uses & Benefits
- Magnesium aluminum alloy improves the mechanical strength and welding characteristics and hence it is used in aeroplane and car manufacturing.
-
It is also used to remove sulfur from the molten iron and steel.
- It has an ability to absorb neutrons and hence it is used to make control rods in nuclear submarines. And this metal is also used in Plasma welding torches.
-
It alloys with iron, titanium and niobium are very useful.
Industrial Uses
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry
Ammunition Industry
Medical Uses
-
-
Other Uses
Surgical Instruments Manufacturing
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Non Toxic
Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
37.80 Blood/mg dm-30.00 Blood/mg dm-3
0
1970
👆🏻
In Bone
1,800.00 p.p.m.0.00 p.p.m.
0
170000
👆🏻
Melting Point
650.00 °C2,150.00 °C
-38.83
3410
👆🏻
Boiling Point
1,107.00 °C5,400.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
Gray
Gray
Luster
-
Metallic
Hardness
Mohs Hardness
2.505.50
0.2
8.5
👆🏻
Brinell Hardness
260.00 MPa1,450.00 MPa
0.14
3490
👆🏻
Vickers Hardness
260.00 MPa1,520.00 MPa
0
3920
👆🏻
Speed of Sound
4,940.00 m/s3,010.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
1.492.00
0.155
3.41
👆🏻
Reflectivity
74.00 %71.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Mg
Hf
Isotopes
Known Isotopes
1532
0
38
👆🏻
Electronegativity
Pauling Electronegativity
1.311.30
0
2.6
👆🏻
Sanderson Electronegativity
1.321.30
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.231.23
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.371.30
0.62
2.48
👆🏻
Allen Electronegativity
1.291.16
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.692.70
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
737.70 kJ/mol658.50 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,450.70 kJ/mol1,440.00 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
7,732.70 kJ/mol2,250.00 kJ/mol
392.8
34230
👆🏻
4th Energy Level
10,542.50 kJ/mol3,216.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
13,630.00 kJ/mol6,585.00 kJ/mol
392
97510
👆🏻
6th Energy Level
18,020.00 kJ/mol6,585.00 kJ/mol
1007
105800
👆🏻
7th Energy level
21,711.00 kJ/mol6,580.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
25,661.00 kJ/mol6,580.00 kJ/mol
730
125300
👆🏻
9th Energy Level
31,653.00 kJ/mol6,585.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
35,458.00 kJ/mol6,590.00 kJ/mol
392
144300
👆🏻
11th Energy Level
169,988.00 kJ/mol6,585.00 kJ/mol
392
169988
👆🏻
12th Energy Level
189,368.00 kJ/mol6,580.00 kJ/mol
0
189368
👆🏻
13th Energy Level
7,370.00 kJ/mol6,580.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
737.70 kJ/mol658.50 kJ/mol
380
86450
👆🏻
15th Energy Level
73,700.00 kJ/mol65,800.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
73,770.00 kJ/mol658.50 kJ/mol
375.7
109480
👆🏻
17th Energy Level
737.70 kJ/mol658.50 kJ/mol
375.7
122200
👆🏻
18th Energy Level
7,370.00 kJ/mol6,585.00 kJ/mol
0
134810
👆🏻
19th Energy Level
737.70 kJ/mol658.50 kJ/mol
375.7
148700
👆🏻
20th Energy Level
737.00 kJ/mol658.00 kJ/mol
0
171200
👆🏻
21st Energy Level
737.70 kJ/mol658.50 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
738.00 kJ/mol658.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
737.70 kJ/mol658.50 kJ/mol
357.6
198800
👆🏻
24th Energy Level
737.70 kJ/mol658.50 kJ/mol
297.3
195200
👆🏻
25th Energy Level
737.70 kJ/mol658.00 kJ/mol
0
121900
👆🏻
26th Energy Level
737.70 kJ/mol658.50 kJ/mol
357.6
127700
👆🏻
27th Energy Level
737.70 kJ/mol658.50 kJ/mol
0
133800
👆🏻
28th Energy Level
737.70 kJ/mol658.50 kJ/mol
297.3
139800
👆🏻
29th Energy Level
737.70 kJ/mol658.50 kJ/mol
0
148100
👆🏻
30th Energy Level
737.70 kJ/mol658.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
0.45 g/amp-hr1.66 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
3.66 eV3.90 eV
2.14
6
👆🏻
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Number
1272
3
117
👆🏻
Electron Configuration
[Ne] 3s2
[Xe] 4f14 5d2 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
Atom
Number of Protons
1272
3
117
👆🏻
Number of Neutrons
12106
4
285
👆🏻
Number of Electrons
1272
3
117
👆🏻
Radius of an Atom
Atomic Radius
160.00 pm159.00 pm
0
348
👆🏻
Covalent Radius
141.00 pm175.00 pm
0
260
👆🏻
Van der Waals Radius
173.00 pm200.00 pm
0
348
👆🏻
Atomic Weight
24.31 amu178.49 amu
6.94
294
👆🏻
Atomic Volume
13.97 cm3/mol13.60 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
40.00 (-eV)81.00 (-eV)
0
392.42
👆🏻
Lattice Constant
320.94 pm319.64 pm
0
891.25
👆🏻
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.621.58
0.423
1.9
👆🏻
Density
Density At Room Temperature
1.74 g/cm313.31 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
1.58 g/cm312.00 g/cm3
0.512
41
👆🏻
Tensile Strength
150.00 MPa445.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)0.00 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)0.00 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
17.00 GPa30.00 GPa
1.3
222
👆🏻
Bulk Modulus
45.00 GPa110.00 GPa
0
462
👆🏻
Young's Modulus
45.00 GPa78.00 GPa
0
528
👆🏻
Poisson Ratio
0.290.37
0.032
0.47
👆🏻
Other Mechanical Properties
-
Ductile, Malleable
Magnetic Characteristics
Specific Gravity
1.7413.31
0.53
4500
👆🏻
Magnetic Ordering
Paramagnetic
Paramagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
43.90 nΩ·m331.00 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.23 106/cm Ω0.03 106/cm Ω
0
0.63
👆🏻
Electron Affinity
0.00 kJ/mol0.00 kJ/mol
0
222.8
👆🏻
Specific Heat
1.02 J/(kg K)0.14 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
24.87 J/mol·K25.73 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
156.00 W/m·K23.00 W/m·K
0
429
👆🏻
Critical Temperature
923.00 K2,500.00 K
26.3
3695
👆🏻
Thermal Expansion
24.80 µm/(m·K)5.90 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
128.70 kJ/mol661.10 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
8.95 kJ/mol25.10 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
148.50 kJ/mol703.00 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
32.70 J/mol.K43.60 J/mol.K
9.5
198.1
👆🏻