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Mendelevium Beryllium Comparison

Mendelevium
Beryllium
Beryllium Mendelevium comparison


Periodic Table
Symbol
Md  
Be  
Group Number
3  
15
2  
16
Period Number
7  
2  
Block
f block  
s block  
Element Family
Actinide  
Alkaline Earth  
CAS Number
7440111  
99+
7440417  
99+
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Beryllium is best anti corrosion metal.
  • Beryllium is the lightest metal and still it is stronger than steel.
  • It also finds various applications in Nuclear reactors as a reflector.
  
Sources
Bombarding Einsteinium with Helium Ions  
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Louis Nicolas Vauquelin  
Discovery
In 1955  
In 1797  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
24
Abundance In Sun
-  
0.00 %  
29
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
-  
0.00 %  
35
Abundance In Oceans
-  
0.00 %  
39
Abundance In Humans
0.00 %  
24
0.00 %  
22
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • Its alloys with copper or nickel are used in manufacturing Gyroscopes, springs, electrical contact and non sparking tools.
  • Beryllium Alloys are used as a material for aircraft, missiles, spacecraft and satellite.
  
Industrial Uses
-  
Aerospace Industry, Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
35
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
37
Physical
Melting Point
827.00 °C  
99+
1,278.00 °C  
36
Boiling Point
0.00 °C  
99+
2,970.00 °C  
33
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
White Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
-  
5.50  
7
Brinell Hardness
350.00 MPa  
36
590.00 MPa  
25
Vickers Hardness
0.00 MPa  
99+
1,670.00 MPa  
9
Speed of Sound
2,680.00 m/s  
99+
12,890.00 m/s  
2
Optical Properties
  
  
Refractive Index
1.30  
99+
1.56  
34
Reflectivity
66.00 %  
17
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Md  
Be  
Isotopes
  
  
Known Isotopes
16  
23
9  
29
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.57  
25
Sanderson Electronegativity
1.30  
25
1.81  
15
Allred Rochow Electronegativity
1.20  
28
1.47  
15
Mulliken-Jaffe Electronegativity
1.30  
33
1.54  
24
Allen Electronegativity
1.30  
40
1.58  
26
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.43  
30
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol  
99+
899.50 kJ/mol  
7
2nd Energy Level
1,235.00 kJ/mol  
99+
1,757.10 kJ/mol  
24
3rd Energy Level
2,470.00 kJ/mol  
99+
14,848.70 kJ/mol  
2
4th Energy Level
3,840.00 kJ/mol  
99+
21,006.60 kJ/mol  
2
5th Energy Level
6,350.00 kJ/mol  
36
2,970.00 kJ/mol  
99+
6th Energy Level
6,350.00 kJ/mol  
99+
1,470.00 kJ/mol  
99+
7th Energy level
6,350.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
8th Energy Level
6,350.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
9th Energy Level
6,350.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
10th Energy Level
6,350.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
11th Energy Level
6,400.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
12th Energy Level
60,100.00 kJ/mol  
16
29,700.00 kJ/mol  
35
13th Energy Level
6,350.00 kJ/mol  
37
2,970.00 kJ/mol  
99+
14th Energy Level
1,150.00 kJ/mol  
99+
2,970.00 kJ/mol  
99+
15th Energy Level
63,500.00 kJ/mol  
37
89,900.00 kJ/mol  
5
16th Energy Level
635.00 kJ/mol  
99+
89,900.00 kJ/mol  
8
17th Energy Level
1,107.00 kJ/mol  
21
2,970.00 kJ/mol  
14
18th Energy Level
6,350.00 kJ/mol  
39
8,995.00 kJ/mol  
13
19th Energy Level
635.00 kJ/mol  
99+
899.50 kJ/mol  
22
20th Energy Level
635.00 kJ/mol  
40
899.00 kJ/mol  
12
21st Energy Level
6,350.00 kJ/mol  
13
2,970.00 kJ/mol  
26
22nd Energy Level
635.00 kJ/mol  
34
899.00 kJ/mol  
10
23rd Energy Level
6,350.00 kJ/mol  
13
2,970.00 kJ/mol  
31
24th Energy Level
635.00 kJ/mol  
36
297.30 kJ/mol  
99+
25th Energy Level
635.00 kJ/mol  
38
2,970.00 kJ/mol  
2
26th Energy Level
635.00 kJ/mol  
37
2,970.00 kJ/mol  
2
27th Energy Level
635.00 kJ/mol  
39
297.30 kJ/mol  
99+
28th Energy Level
635.00 kJ/mol  
99+
297.30 kJ/mol  
99+
29th Energy Level
635.00 kJ/mol  
99+
2,970.00 kJ/mol  
2
30th Energy Level
635.00 kJ/mol  
40
2,970.00 kJ/mol  
2
Electrochemical Equivalent
3.21 g/amp-hr  
13
0.17 g/amp-hr  
99+
Electron Work Function
3.89 eV  
37
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
101  
17
4  
99+
Electron Configuration
[Rn] 5f13 7s2  
[He] 2s2  
Crystal Structure
Not Known  
Hexagonal Close Packed (HCP)  
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
HCP-Crystal-Structure-of-Beryllium.jpg#100  
Atom
  
  
Number of Protons
101  
17
4  
99+
Number of Neutrons
157  
8
5  
99+
Number of Electrons
101  
17
4  
99+
Radius of an Atom
  
  
Atomic Radius
175.00 pm  
21
112.00 pm  
99+
Covalent Radius
175.00 pm  
25
96.00 pm  
99+
Van der Waals Radius
246.00 pm  
12
153.00 pm  
99+
Atomic Weight
258.00 amu  
14
9.01 amu  
99+
Atomic Volume
19.90 cm3/mol  
32
5.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Lithium
  
Next Element
Nobelium
  
Sodium
  
Valence Electron Potential
63.70 (-eV)  
23
82.00 (-eV)  
15
Lattice Constant
-  
228.58 pm  
99+
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
36
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
10.30 g/cm3  
38
1.85 g/cm3  
99+
Density When Liquid (at m.p.)
10.30 g/cm3  
39
1.69 g/cm3  
99+
Tensile Strength
80.00 MPa  
29
287.00 MPa  
16
Viscosity
0.00  
25
0.00  
17
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
20
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
132.00 GPa  
7
Bulk Modulus
0.00 GPa  
99+
130.00 GPa  
13
Young's Modulus
12.00 GPa  
99+
287.00 GPa  
7
Poisson Ratio
0.30  
14
0.03  
36
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.50  
29
1.85  
99+
Magnetic Ordering
-  
Diamagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
11
Electrical Properties
  
  
Electrical Property
-  
Semiconductor  
Resistivity
0.63 nΩ·m  
99+
36.00 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.31 106/cm Ω  
5
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.10 J/(kg K)  
99+
1.82 J/(kg K)  
2
Molar Heat Capacity
27.00 J/mol·K  
29
16.44 J/mol·K  
99+
Thermal Conductivity
0.00 W/m·K  
99+
200.00 W/m·K  
6
Critical Temperature
1,100.00 K  
99+
1,551.00 K  
39
Thermal Expansion
11.60 µm/(m·K)  
99+
11.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
380.50 kJ/mol  
26
294.70 kJ/mol  
99+
Enthalpy of Fusion
-  
11.72 kJ/mol  
36
Enthalpy of Atomization
410.80 kJ/mol  
25
326.40 kJ/mol  
40
Standard Molar Entropy
37.40 J/mol.K  
99+
9.50 J/mol.K  
99+
Summary >>
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