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Holmium
Holmium

Actinium
Actinium



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Holmium
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Actinium

Holmium Actinium Comparison

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1 Periodic Table
1.1 Symbol
Ho
Ac
1.2 Group Number
NANA
Gadolinium Metal
0 17
1.6 Period Number
67
Lithium Metal
2 7
1.7 Block
f block
f block
2.2 Element Family
Lanthanide
Actinide
2.3 CAS Number
74406007440348
Aluminium Metal
7429905 54386242
2.7 Space Group Name
P63/mmc
Fm_ 3m
2.8 Space Group Number
194.00225.00
Plutonium Metal
11 229
4 Facts
4.1 Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
Not Available
4.2 Sources
Found in Minerals, Mining, Ores of Minerals
Obtained by Treating Radium with Neutrons, Ores of metals
4.3 History
4.3.1 Who Discovered
Marc Delafontaine
Friedrich Oskar Giesel
4.3.2 Discovery
In 1878
In 1902
4.4 Abundance
4.4.1 Abundance In Universe
5 * 10-8 %NA
Thallium Metal
5E-09 0.11
5.1.2 Abundance In Sun
~-9999 %~-9999 %
Beryllium Metal
1E-08 0.1
5.2.2 Abundance In Meteorites
0.00 %NA
Gold Metal
1.7E-07 22
5.4.2 Abundance In Earth's Crust
0.00 %NA
Radium Metal
9.9E-12 8.1
5.4.5 Abundance In Oceans
0.00 %NA
Protactinium Metal
2E-23 1.1
5.5.1 Abundance In Humans
NANA
Radium Metal
1E-13 1.4
6 Uses
6.1 Uses & Benefits
  • Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
  • Alloys of Holmium are used to produce Magnet.
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
6.1.1 Industrial Uses
NA
NA
6.1.2 Medical Uses
NA
NA
6.1.3 Other Uses
Alloys, Nuclear Research
Alloys, Nuclear Research, Research Purposes
6.2 Biological Properties
6.2.1 Toxicity
Low Toxic
Toxic
6.2.2 Present in Human Body
6.2.4 In Blood
NA0.00 Blood/mg dm-3
Plutonium Metal
0 1970
7.2.2 In Bone
NA0.00 p.p.m.
Plutonium Metal
0 170000
9 Physical
9.1 Melting Point
1,461.00 °C1,227.00 °C
Francium Metal
27 3410
9.2 Boiling Point
2,600.00 °C3,200.00 °C
Flerovium Metal
147 5660
9.3 Appearance
9.3.1 Physical State
Solid
Solid
9.3.2 Color
Silvery White
Silvery White
9.3.3 Luster
Metallic
NA
9.4 Hardness
9.4.1 Mohs Hardness
NANA
Cesium Metal
0.2 8.5
10.1.1 Brinell Hardness
746.00 MPaNA
Cesium Metal
0.14 3490
10.4.1 Vickers Hardness
481.00 MPaNA
Palladium Metal
121 3430
10.5 Speed of Sound
2,760.00 m/sNA
Thallium Metal
818 16200
10.8 Optical Properties
10.8.1 Refractive Index
NANA
Mercury Metal
1.000933 1.7229
10.8.3 Reflectivity
NANA
Molybdenum Metal
58 97
10.9 Allotropes
10.9.1 α Allotropes
Not Available
Not Available
10.9.2 β Allotropes
Not Available
Not Available
10.9.3 γ Allotropes
Not Available
Not Available
11 Chemical
11.1 Chemical Formula
Ho
Ac
11.2 Isotopes
11.2.1 Known Isotopes
3429
Tennessine Metal
0 38
11.3 Electronegativity
11.3.1 Pauling Electronegativity
1.231.10
Francium Metal
0.7 2.54
11.3.4 Sanderson Electronegativity
NANA
Cesium Metal
0.22 2.56
11.4.2 Allred Rochow Electronegativity
1.101.00
Cesium Metal
0.86 1.82
11.4.5 Mulliken-Jaffe Electronegativity
NANA
Cesium Metal
0.62 2.48
11.5.5 Allen Electronegativity
NANA
Cesium Metal
0.659 2.7
12.3 Electropositivity
12.3.1 Pauling Electropositivity
2.772.90
Gold Metal
1.46 3.3
12.4 Ionization Energies
12.4.1 1st Energy Level
581.00 kJ/mol499.00 kJ/mol
Cesium Metal
375.7 26130
12.6.1 2nd Energy Level
1,140.00 kJ/mol1,170.00 kJ/mol
Ruthenium Metal
710.2162 28750
12.7.2 3rd Energy Level
2,204.00 kJ/mol1,900.00 kJ/mol
Osmium Metal
1600 34230
13.4.3 4th Energy Level
4,100.00 kJ/mol4,700.00 kJ/mol
Thorium Metal
2780 37066
13.4.6 5th Energy Level
NANA
Dubnium Metal
4305.2 97510
13.6.2 6th Energy Level
NANA
Seaborgium Metal
5715.8 105800
13.7.2 7th Energy level
NANA
Bohrium Metal
7226.8 114300
13.8.2 8th Energy Level
NANA
Hassium Metal
8857.4 125300
13.9.2 9th Energy Level
NANA
Yttrium Metal
14110 134700
13.11.1 10th Energy Level
NANA
Strontium Metal
17100 144300
13.12.2 11th Energy Level
NANA
Yttrium Metal
19900 169988
13.14.2 12th Energy Level
NANA
Molybdenum Metal
22219 189368
14.1.3 13th Energy Level
NANA
Molybdenum Metal
26930 76015
14.1.6 14th Energy Level
NANA
Molybdenum Metal
29196 86450
14.2.1 15th Energy Level
NANA
Manganese Metal
41987 97510
14.3.2 16th Energy Level
NANA
Iron Metal
47206 109480
14.4.2 17th Energy Level
NANA
Cobalt Metal
52737 122200
14.4.5 18th Energy Level
NANA
Nickel Metal
58570 134810
14.5.3 19th Energy Level
NANA
Copper Metal
64702 148700
14.5.4 20th Energy Level
NANA
Molybdenum Metal
80400 171200
14.5.7 21st Energy Level
NANA
Molybdenum Metal
87000 179100
14.5.8 22nd Energy Level
NANA
Molybdenum Metal
93400 184900
14.5.11 23rd Energy Level
NANA
Molybdenum Metal
98420 198800
14.5.13 24th Energy Level
NANA
Molybdenum Metal
104400 195200
14.6.1 25th Energy Level
NANA
Molybdenum Metal
121900 121900
14.6.3 26th Energy Level
NANA
Molybdenum Metal
127700 127700
15.1.3 27th Energy Level
NANA
Molybdenum Metal
133800 133800
15.1.7 28th Energy Level
NANA
Molybdenum Metal
139800 139800
15.1.9 29th Energy Level
NANA
Molybdenum Metal
148100 148100
15.1.13 30th Energy Level
NANA
Molybdenum Metal
154500 154500
15.3 Electrochemical Equivalent
2.02 g/amp-hr2.82 g/amp-hr
Beryllium Metal
0.16812 8.3209
15.4 Electron Work Function
NANA
Cesium Metal
2.14 5.65
15.5 Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
16 Atomic
16.1 Atomic Number
6789
Lithium Metal
3 117
16.3 Electron Configuration
[Xe] 4f11 6s2
[Rn] 6d1 7s2
16.4 Crystal Structure
Hexagonal Close Packed (HCP)
Face Centered Cubic (FCC)
16.4.1 Crystal Lattice
16.5 Atom
16.5.1 Number of Protons
6789
Lithium Metal
3 117
18.1.1 Number of Neutrons
98138
Lithium Metal
4 184
18.5.1 Number of Electrons
6789
Lithium Metal
3 117
18.7 Radius of an Atom
18.7.1 Atomic Radius
176.00 pm195.00 pm
Beryllium Metal
112 265
18.8.2 Covalent Radius
192.00 pmNA
Beryllium Metal
96 260
18.9.2 Van der Waals Radius
216.00 pmNA
Zinc Metal
139 348
18.12 Atomic Weight
164.93 amu227.00 amu
Lithium Metal
6.94 294
18.14 Atomic Volume
18.70 cm3/mol22.54 cm3/mol
Manganese Metal
1.39 71.07
18.18 Adjacent Atomic Numbers
18.18.1 Previous Element
18.18.2 Next Element
18.19 Valence Electron Potential
47.90 (-eV)38.60 (-eV)
Francium Metal
8 392.42
19.2 Lattice Constant
357.73 pm567.00 pm
Beryllium Metal
228.58 891.25
19.3 Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
19.4 Lattice C/A Ratio
1.57NA
Beryllium Metal
1.567 1.886
20 Mechanical
20.1 Density
20.1.1 Density At Room Temperature
8.79 g/cm310.00 g/cm3
Lithium Metal
0.534 40.7
20.3.2 Density When Liquid (at m.p.)
8.34 g/cm3NA
Lithium Metal
0.512 20
20.5 Tensile Strength
NANA
Indium Metal
2.5 11000
20.6 Viscosity
NANA
Mercury Metal
0.001526 0.001526
20.7 Vapor Pressure
20.7.1 Vapor Pressure at 1000 K
0.00 (Pa)NA
Cerium Metal
2.47E-11 121
20.8.1 Vapor Pressure at 2000 K
NANA
Tungsten Metal
2.62E-10 774
21.2 Elasticity properties
21.2.1 Shear Modulus
26.30 GPaNA
Potassium Metal
1.3 222
21.3.3 Bulk Modulus
40.20 GPaNA
Cesium Metal
1.6 462
21.3.5 Young's Modulus
64.80 GPaNA
Cesium Metal
1.7 528
21.4 Poisson Ratio
0.23NA
Beryllium Metal
0.032 0.47
21.5 Other Mechanical Properties
Ductile, Malleable, Sectile
NA
22 Magnetic
22.1 Magnetic Characteristics
22.1.1 Specific Gravity
8.8010.07
Lithium Metal
0.53 4500
22.1.2 Magnetic Ordering
Paramagnetic
Paramagnetic
22.1.3 Permeability
NANA
Bismuth Metal
1.25643E-06 0.0063
22.1.4 Susceptibility
NANA
Bismuth Metal
-0.000166 200000
23.2 Electrical Properties
23.2.1 Electrical Property
Conductor
Unknown
23.2.2 Resistivity
814.00 nΩ·mNA
Thallium Metal
0.18 961
23.3.1 Electrical Conductivity
0.01 106/cm ΩNA
Plutonium Metal
0.00666 0.63
23.4.1 Electron Affinity
50.00 kJ/molNA
Mercury Metal
0 222.8
24 Thermal
24.1 Specific Heat
0.16 J/(kg K)0.12 J/(kg K)
Americium Metal
0.11 3.6
24.2 Molar Heat Capacity
27.15 J/mol·K27.20 J/mol·K
Beryllium Metal
16.443 62.7
24.4 Thermal Conductivity
16.20 W/m·K12.00 W/m·K
Neptunium Metal
6.3 429
24.6 Critical Temperature
NANA
Ytterbium Metal
26.3 3223
24.7 Thermal Expansion
11.20 µm/(m·K)NA
Tungsten Metal
4.5 97
24.8 Enthalpy
24.8.1 Enthalpy of Vaporization
241.00 kJ/molNA
Zinc Metal
7.32 799.1
24.8.3 Enthalpy of Fusion
11.76 kJ/molNA
Cesium Metal
2.1 35.23
24.9.1 Enthalpy of Atomization
301.00 kJ/mol301.00 kJ/mol
Mercury Metal
61.5 837
24.10 Standard Molar Entropy
75.30 J/mol.K56.50 J/mol.K
Beryllium Metal
9.5 198.1