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Gadolinium Mendelevium Comparison

Gadolinium
Mendelevium
Mendelevium Gadolinium comparison


Periodic Table
Symbol
Gd  
Md  
Group Number
0  
18
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7440542  
33
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Gadolinium is not found free in nature, hence it is not a native metal.
  • Gadolinium metal found in minerals like Monazite and Bastnaesite.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Found in Minerals, Mining  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Jean Charles Galissard de Marignac  
Lawrence Berkeley National Laboratory  
Discovery
In 1880  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
34
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
30
-  
Abundance In Oceans
0.00 %  
38
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Its alloys are also used in making Magnets, electronic components and Data storage devices.
  • Compound of Gadolinium metal are used in magnetic resonance imaging (MRI).
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Non Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,311.00 °C  
35
827.00 °C  
99+
Boiling Point
3,233.00 °C  
26
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.50  
10
-  
Brinell Hardness
700.00 MPa  
17
350.00 MPa  
36
Vickers Hardness
510.00 MPa  
34
0.00 MPa  
99+
Speed of Sound
2,680.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.97  
16
1.30  
99+
Reflectivity
59.00 %  
24
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Gd  
Md  
Isotopes
  
  
Known Isotopes
26  
13
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
1.30  
33
Sanderson Electronegativity
1.20  
32
1.30  
25
Allred Rochow Electronegativity
1.11  
30
1.20  
28
Mulliken-Jaffe Electronegativity
1.20  
39
1.30  
33
Allen Electronegativity
1.20  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.80  
15
2.70  
22
Ionization Energies
  
  
1st Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,170.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
1,990.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
4,250.00 kJ/mol  
40
3,840.00 kJ/mol  
99+
5th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
7th Energy level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
5,930.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
59,300.00 kJ/mol  
17
60,100.00 kJ/mol  
16
13th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
5,930.00 kJ/mol  
36
1,150.00 kJ/mol  
99+
15th Energy Level
59,300.00 kJ/mol  
99+
63,500.00 kJ/mol  
37
16th Energy Level
59,300.00 kJ/mol  
37
635.00 kJ/mol  
99+
17th Energy Level
594.10 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
5,930.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
594.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
593.40 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
593.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
593.40 kJ/mol  
99+
6,350.00 kJ/mol  
13
24th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
593.00 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
99+
29th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
593.40 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
1.96 g/amp-hr  
36
3.21 g/amp-hr  
13
Electron Work Function
3.10 eV  
99+
3.89 eV  
37
Other Chemical Properties
Corrosion, Flammable, Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
64  
99+
101  
17
Electron Configuration
[Xe] 4f7 5d1 6s2  
[Rn] 5f13 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Not Known  
Crystal Lattice
HCP-Crystal-Structure-of-Gadolinium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
64  
99+
101  
17
Number of Neutrons
93  
38
157  
8
Number of Electrons
64  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
175.00 pm  
21
Covalent Radius
196.00 pm  
14
175.00 pm  
25
Van der Waals Radius
237.00 pm  
19
246.00 pm  
12
Atomic Weight
47.87 amu  
99+
258.00 amu  
14
Atomic Volume
19.90 cm3/mol  
32
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Europium
  
Fermium
  
Next Element
Terbium
  
Nobelium
  
Valence Electron Potential
46.10 (-eV)  
35
63.70 (-eV)  
23
Lattice Constant
363.60 pm  
35
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.59  
29
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
7.90 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
7.40 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
158.00 MPa  
23
80.00 MPa  
29
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
32
0.00 (Pa)  
37
Vapor Pressure at 2000 K
7.39 (Pa)  
9
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
21.80 GPa  
99+
32.00 GPa  
24
Bulk Modulus
37.90 GPa  
99+
0.00 GPa  
99+
Young's Modulus
54.80 GPa  
38
12.00 GPa  
99+
Poisson Ratio
0.26  
23
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.90  
99+
13.50  
29
Magnetic Ordering
Ferromagnetic  
-  
Permeability
0.00 H/m  
12
0.00 H/m  
11
Susceptibility
0.00  
4
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
1.31 nΩ·m  
99+
0.63 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
50.00 kJ/mol  
26
Thermal
Specific Heat
0.23 J/(kg K)  
27
0.10 J/(kg K)  
99+
Molar Heat Capacity
37.03 J/mol·K  
3
27.00 J/mol·K  
29
Thermal Conductivity
10.60 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,585.00 K  
38
1,100.00 K  
99+
Thermal Expansion
9.40 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
359.40 kJ/mol  
30
380.50 kJ/mol  
26
Enthalpy of Fusion
10.05 kJ/mol  
99+
-  
Enthalpy of Atomization
352.00 kJ/mol  
36
410.80 kJ/mol  
25
Standard Molar Entropy
68.10 J/mol.K  
16
37.40 J/mol.K  
99+
Summary >>
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