×

Mendelevium
Mendelevium

Francium
Francium



ADD
Compare
X
Mendelevium
X
Francium

Mendelevium vs Francium

1 Periodic Table
1.1 Symbol
Md
Fr
1.2 Group Number
NA1
Gadolinium
0 17
1.3 Period Number
77
Lithium
2 7
1.4 Block
f block
s block
1.5 Element Family
Actinide
Alkali
1.6 CAS Number
74401117440735
Aluminium
7429905 54386242
1.7 Space Group Name
Not Available
Not Available
1.8 Space Group Number
NANA
Plutonium
11 229
2 Facts
2.1 Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
2.2 Sources
Bombarding Einsteinium with Helium Ions
Formed by Decay Process, Mining
2.3 History
2.3.1 Who Discovered
Lawrence Berkeley National Laboratory
Marguerite Perey
2.3.2 Discovery
In 1955
In 1939
2.4 Abundance
2.4.1 Abundance In Universe
NANA
Thallium
5E-09 0.11
2.4.2 Abundance In Sun
~-9999 %~-9999 %
Beryllium
1E-08 0.1
2.4.3 Abundance In Meteorites
NANA
Gold
1.7E-07 22
2.4.4 Abundance In Earth's Crust
NANA
Radium
9.9E-12 8.1
2.4.5 Abundance In Oceans
NANA
Protactinium
2E-23 1.1
2.4.6 Abundance In Humans
NANA
Radium
1E-13 1.4
3 Uses
3.1 Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  • Francium has no known uses as it has a half life of only 22 minutes.
3.1.1 Industrial Uses
NA
NA
3.1.2 Medical Uses
NA
NA
3.1.3 Other Uses
NA
NA
3.2 Biological Properties
3.2.1 Toxicity
Unknown
NA
3.2.2 Present in Human Body
3.2.3 In Blood
0.00 Blood/mg dm-30.00 Blood/mg dm-3
Plutonium
0 1970
3.2.4 In Bone
0.00 p.p.m.0.00 p.p.m.
Plutonium
0 170000
4 Physical
4.1 Melting Point
827.00 °C27.00 °C
Tin
27 3410
4.2 Boiling Point
NA677.00 °C
Flerovium
147 5660
4.3 Appearance
4.3.1 Physical State
Solid
Solid
4.3.2 Color
Unknown
NA
4.3.3 Luster
Metallic
NA
4.4 Hardness
4.4.1 Mohs Hardness
NANA
Cesium
0.2 8.5
4.4.2 Brinell Hardness
NANA
Cesium
0.14 3490
4.4.3 Vickers Hardness
NANA
Palladium
121 3430
4.5 Speed of Sound
NANA
Thallium
818 16200
4.6 Optical Properties
4.6.1 Refractive Index
NANA
Mercury
1.000933 1.7229
4.6.2 Reflectivity
NANA
Molybdenum
58 97
4.7 Allotropes
4.7.1 α Allotropes
Not Available
Not Available
4.7.2 β Allotropes
Not Available
Not Available
4.7.3 γ Allotropes
Not Available
Not Available
5 Chemical
5.1 Chemical Formula
Md
Fr
5.2 Isotopes
5.2.1 Known Isotopes
1633
Tennessine
0 38
5.3 Electronegativity
5.3.1 Pauling Electronegativity
1.300.70
Sodium
0.7 2.54
5.3.2 Sanderson Electronegativity
NANA
Cesium
0.22 2.56
5.3.3 Allred Rochow Electronegativity
1.200.86
Cesium
0.86 1.82
5.3.4 Mulliken-Jaffe Electronegativity
NA0.68
Cesium
0.62 2.48
5.3.5 Allen Electronegativity
NA0.67
Cesium
0.659 2.7
5.4 Electropositivity
5.4.1 Pauling Electropositivity
2.703.30
Gold
1.46 3.3
5.5 Ionization Energies
5.5.1 1st Energy Level
635.00 kJ/mol380.00 kJ/mol
Cesium
375.7 26130
5.5.2 2nd Energy Level
1,235.00 kJ/molNA
Ruthenium
710.2162 28750
5.5.3 3rd Energy Level
2,470.00 kJ/molNA
Osmium
1600 34230
5.5.4 4th Energy Level
3,840.00 kJ/molNA
Thorium
2780 37066
5.5.5 5th Energy Level
NANA
Dubnium
4305.2 97510
5.5.6 6th Energy Level
NANA
Seaborgium
5715.8 105800
5.5.7 7th Energy level
NANA
Bohrium
7226.8 114300
5.5.8 8th Energy Level
NANA
Hassium
8857.4 125300
5.5.9 9th Energy Level
NANA
Yttrium
14110 134700
5.5.10 10th Energy Level
NANA
Strontium
17100 144300
5.5.11 11th Energy Level
NANA
Yttrium
19900 169988
5.5.12 12th Energy Level
NANA
Molybdenum
22219 189368
5.5.13 13th Energy Level
NANA
Molybdenum
26930 76015
5.5.14 14th Energy Level
NANA
Molybdenum
29196 86450
5.5.15 15th Energy Level
NANA
Manganese
41987 97510
5.5.16 16th Energy Level
NANA
Iron
47206 109480
5.5.17 17th Energy Level
NANA
Cobalt
52737 122200
5.5.18 18th Energy Level
NANA
Nickel
58570 134810
5.5.19 19th Energy Level
NANA
Copper
64702 148700
5.5.20 20th Energy Level
NANA
Molybdenum
80400 171200
5.5.21 21st Energy Level
NANA
Molybdenum
87000 179100
5.5.22 22nd Energy Level
NANA
Molybdenum
93400 184900
5.5.23 23rd Energy Level
NANA
Molybdenum
98420 198800
5.5.24 24th Energy Level
NANA
Molybdenum
104400 195200
5.5.25 25th Energy Level
NANA
Molybdenum
121900 121900
5.5.26 26th Energy Level
NANA
Molybdenum
127700 127700
5.5.27 27th Energy Level
NANA
Molybdenum
133800 133800
5.5.28 28th Energy Level
NANA
Molybdenum
139800 139800
5.5.29 29th Energy Level
NANA
Molybdenum
148100 148100
5.5.30 30th Energy Level
NANA
Molybdenum
154500 154500
5.6 Electrochemical Equivalent
3.21 g/amp-hr8.32 g/amp-hr
Beryllium
0.16812 8.3209
5.7 Electron Work Function
NANA
Cesium
2.14 5.65
5.8 Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity, Solubility
6 Atomic
6.1 Atomic Number
10187
Lithium
3 117
6.2 Electron Configuration
[Rn] 5f13 7s2
[Rn] 7s1
6.3 Crystal Structure
Not Known
Body Centered Cubic (BCC)
6.3.1 Crystal Lattice
6.4 Atom
6.4.1 Number of Protons
10187
Lithium
3 117
6.4.2 Number of Neutrons
157136
Lithium
4 184
6.4.3 Number of Electrons
10187
Lithium
3 117
6.5 Radius of an Atom
6.5.1 Atomic Radius
NANA
Beryllium
112 265
6.5.2 Covalent Radius
NA260.00 pm
Beryllium
96 260
6.5.3 Van der Waals Radius
246.00 pm348.00 pm
Zinc
139 348
6.6 Atomic Weight
258.00 amu223.00 amu
Lithium
6.94 294
6.7 Atomic Volume
NANA
Manganese
1.39 71.07
6.8 Adjacent Atomic Numbers
6.8.1 Previous Element
6.8.2 Next Element
6.9 Valence Electron Potential
NA8.00 (-eV)
Palladium
8 392.42
6.10 Lattice Constant
NANA
Beryllium
228.58 891.25
6.11 Lattice Angles
NA
NA
6.12 Lattice C/A Ratio
NANA
Beryllium
1.567 1.886
7 Mechanical
7.1 Density
7.1.1 Density At Room Temperature
NA1.87 g/cm3
Lithium
0.534 40.7
7.1.2 Density When Liquid (at m.p.)
NANA
Lithium
0.512 20
7.2 Tensile Strength
NANA
Indium
2.5 11000
7.3 Viscosity
NANA
Mercury
0.001526 0.001526
7.4 Vapor Pressure
7.4.1 Vapor Pressure at 1000 K
NANA
Cerium
2.47E-11 121
7.4.2 Vapor Pressure at 2000 K
NANA
Tungsten
2.62E-10 774
7.5 Elasticity properties
7.5.1 Shear Modulus
NANA
Potassium
1.3 222
7.5.2 Bulk Modulus
NANA
Cesium
1.6 462
7.5.3 Young's Modulus
NANA
Cesium
1.7 528
7.6 Poisson Ratio
NANA
Beryllium
0.032 0.47
7.7 Other Mechanical Properties
Unknown
NA
8 Magnetic
8.1 Magnetic Characteristics
8.1.1 Specific Gravity
NANA
Lithium
0.53 4500
8.1.2 Magnetic Ordering
Unknown
Paramagnetic
8.1.3 Permeability
NANA
Bismuth
1.25643E-06 0.0063
8.1.4 Susceptibility
NANA
Bismuth
-0.000166 200000
8.2 Electrical Properties
8.2.1 Electrical Property
Unknown
Poor Conductor
8.2.2 Resistivity
NA3.00 nΩ·m
Thallium
0.18 961
8.2.3 Electrical Conductivity
NA0.03 106/cm Ω
Plutonium
0.00666 0.63
8.2.4 Electron Affinity
NANA
Mercury
0 222.8
9 Thermal
9.1 Specific Heat
NANA
Americium
0.11 3.6
9.2 Molar Heat Capacity
NANA
Beryllium
16.443 62.7
9.3 Thermal Conductivity
NA15.00 W/m·K
Neptunium
6.3 429
9.4 Critical Temperature
NANA
Ytterbium
26.3 3223
9.5 Thermal Expansion
NANA
Tungsten
4.5 97
9.6 Enthalpy
9.6.1 Enthalpy of Vaporization
NANA
Zinc
7.32 799.1
9.6.2 Enthalpy of Fusion
NANA
Cesium
2.1 35.23
9.6.3 Enthalpy of Atomization
NA71.00 kJ/mol
Mercury
61.5 837
9.7 Standard Molar Entropy
NANA
Beryllium
9.5 198.1