Curium

Holmium

Curium Holmium Comparison

Curium

Holmium

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1 Periodic Table

1.1 Symbol

1.2 Group Number

NANA

0 17

1.3 Period Number

2 7

1.4 Block

f block

1.5 Element Family

Actinide

Lanthanide

1.6 CAS Number

74405197440600

7429905 54386242

1.7 Space Group Name

Not Available

P63/mmc

1.8 Space Group Number

NA194.00

11 229

2 Facts

2.1 Interesting Facts

Curium metal does not occur free in nature.

Curium metal is a synthetically produced metal.

Holmium metal is very soft and malleable.
Holmium metal is well known for its corrosion resistivity.

2.2 Sources

Bombarding Plutonium with Helium Ions

Found in Minerals, Mining, Ores of Minerals

2.3 History

2.3.1 Who Discovered

Glenn T. Seaborg, Ralph A. James, Albert Ghiorso

Marc Delafontaine

2.3.2 Discovery

In 1944

In 1878

2.4 Abundance

2.4.1 Abundance In Universe

NA5 * 10^-8 %

5E-09 0.11

2.4.2 Abundance In Sun

~-9999 %~-9999 %

1E-08 0.1

2.4.3 Abundance In Meteorites

NA0.00 %

1.7E-07 22

2.4.4 Abundance In Earth's Crust

NA0.00 %

9.9E-12 8.1

2.4.5 Abundance In Oceans

NA0.00 %

2E-23 1.1

2.4.6 Abundance In Humans

NANA

1E-13 1.4

3 Uses

3.1 Uses & Benefits

Curium metal is used to provide power to electrical equipment for space missions.

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.

3.1.1 Industrial Uses

3.1.2 Medical Uses

3.1.3 Other Uses

Research Purposes

Alloys, Nuclear Research

3.2 Biological Properties

3.2.1 Toxicity

Unknown

Low Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

0.00 Blood/mg dm-3NA

0 1970

3.2.4 In Bone

0.00 p.p.m.NA

0 170000

4 Physical

4.1 Melting Point

1,340.00 °C1,461.00 °C

27 3410

4.2 Boiling Point

3,110.00 °C2,600.00 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silver

Silvery White

4.3.3 Luster

Metallic

4.4 Hardness

4.4.1 Mohs Hardness

NANA

0.2 8.5

4.4.2 Brinell Hardness

NA746.00 MPa

0.14 3490

4.4.3 Vickers Hardness

NA481.00 MPa

121 3430

4.5 Speed of Sound

NA2,760.00 m/s

818 16200

4.6 Optical Properties

4.6.1 Refractive Index

NANA

1.000933 1.7229

4.6.2 Reflectivity

NANA

58 97

4.7 Allotropes

✔ ✘

4.7.1 α Allotropes

Not Available

4.7.2 β Allotropes

Not Available

4.7.3 γ Allotropes

Not Available

5 Chemical

5.1 Chemical Formula

5.2 Isotopes

5.2.1 Known Isotopes

1534

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

1.301.23

0.7 2.54

5.3.2 Sanderson Electronegativity

NANA

0.22 2.56

5.3.3 Allred Rochow Electronegativity

1.201.10

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

NANA

0.62 2.48

5.3.5 Allen Electronegativity

NANA

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

2.702.77

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

581.00 kJ/mol581.00 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

1,196.00 kJ/mol1,140.00 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

2,026.00 kJ/mol2,204.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

3,550.00 kJ/mol4,100.00 kJ/mol

2780 37066

5.5.5 5th Energy Level

NANA

4305.2 97510

5.5.6 6th Energy Level

NANA

5715.8 105800

5.5.7 7th Energy level

NANA

7226.8 114300

5.5.8 8th Energy Level

NANA

8857.4 125300

5.5.9 9th Energy Level

NANA

14110 134700

5.5.10 10th Energy Level

NANA

17100 144300

5.5.11 11th Energy Level

NANA

19900 169988

5.5.12 12th Energy Level

NANA

22219 189368

5.5.13 13th Energy Level

NANA

26930 76015

5.5.14 14th Energy Level

NANA

29196 86450

5.5.15 15th Energy Level

NANA

41987 97510

5.5.16 16th Energy Level

NANA

47206 109480

5.5.17 17th Energy Level

NANA

52737 122200

5.5.18 18th Energy Level

NANA

58570 134810

5.5.19 19th Energy Level

NANA

64702 148700

5.5.20 20th Energy Level

NANA

80400 171200

5.5.21 21st Energy Level

NANA

87000 179100

5.5.22 22nd Energy Level

NANA

93400 184900

5.5.23 23rd Energy Level

NANA

98420 198800

5.5.24 24th Energy Level

NANA

104400 195200

5.5.25 25th Energy Level

NANA

121900 121900

5.5.26 26th Energy Level

NANA

127700 127700

5.5.27 27th Energy Level

NANA

133800 133800

5.5.28 28th Energy Level

NANA

139800 139800

5.5.29 29th Energy Level

NANA

148100 148100

5.5.30 30th Energy Level

NANA

154500 154500

5.6 Electrochemical Equivalent

3.07 g/amp-hr2.02 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

NANA

2.14 5.65

5.8 Other Chemical Properties

Ionization, Radioactive Isotopes

Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility

6 Atomic

6.1 Atomic Number

9667

3 117

6.2 Electron Configuration

[Rn] 5f⁷ 6d¹ 7s²

[Xe] 4f¹¹ 6s²

6.3 Crystal Structure

Double Hexagonal Close Packed (DHCP)

Hexagonal Close Packed (HCP)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

9667

3 117

6.4.2 Number of Neutrons

15198

4 184

6.4.3 Number of Electrons

9667

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

174.00 pm176.00 pm

112 265

6.5.2 Covalent Radius

169.00 pm192.00 pm

96 260

6.5.3 Van der Waals Radius

200.00 pm216.00 pm

139 348

6.6 Atomic Weight

247.00 amu164.93 amu

6.94 294

6.7 Atomic Volume

18.28 cm3/mol18.70 cm3/mol

1.39 71.07

6.8 Adjacent Atomic Numbers

6.8.1 Previous Element

6.8.2 Next Element

6.9 Valence Electron Potential

44.50 (-eV)47.90 (-eV)

8 392.42

6.10 Lattice Constant

NA357.73 pm

228.58 891.25

6.11 Lattice Angles

π/2, π/2, 2 π/3

6.12 Lattice C/A Ratio

NA1.57

1.567 1.886

7 Mechanical

7.1 Density

7.1.1 Density At Room Temperature

13.51 g/cm³8.79 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

13.85 g/cm38.34 g/cm3

0.512 20

7.2 Tensile Strength

NANA

2.5 11000

7.3 Viscosity

NANA

0.001526 0.001526

7.4 Vapor Pressure

7.4.1 Vapor Pressure at 1000 K

NA0.00 (Pa)

2.47E-11 121

7.4.2 Vapor Pressure at 2000 K

NANA

2.62E-10 774

7.5 Elasticity properties

7.5.1 Shear Modulus

NA26.30 GPa

1.3 222

7.5.2 Bulk Modulus

NA40.20 GPa

1.6 462

7.5.3 Young's Modulus

NA64.80 GPa

1.7 528

7.6 Poisson Ratio

NA0.23

0.032 0.47

7.7 Other Mechanical Properties

Unknown

Ductile, Malleable, Sectile

8 Magnetic

8.1 Magnetic Characteristics

8.1.1 Specific Gravity

13.518.80

0.53 4500

8.1.2 Magnetic Ordering

Antiferromagnetic

Paramagnetic

8.1.3 Permeability

NANA

1.25643E-06 0.0063

8.1.4 Susceptibility

NANA

-0.000166 200000

8.2 Electrical Properties

8.2.1 Electrical Property

Unknown

Conductor

8.2.2 Resistivity

1.25 nΩ·m814.00 nΩ·m

0.18 961

8.2.3 Electrical Conductivity

NA0.01 10⁶/cm Ω

0.00666 0.63

8.2.4 Electron Affinity

NA50.00 kJ/mol

0 222.8

9 Thermal

9.1 Specific Heat

NA0.16 J/(kg K)

0.11 3.6

9.2 Molar Heat Capacity

NA27.15 J/mol·K

16.443 62.7

9.3 Thermal Conductivity

NA16.20 W/m·K

6.3 429

9.4 Critical Temperature

NANA

26.3 3223

9.5 Thermal Expansion

NA11.20 µm/(m·K)

4.5 97

9.6 Enthalpy

9.6.1 Enthalpy of Vaporization

NA241.00 kJ/mol

7.32 799.1

9.6.2 Enthalpy of Fusion

15.00 kJ/mol11.76 kJ/mol

2.1 35.23

9.6.3 Enthalpy of Atomization

NA301.00 kJ/mol

61.5 837

9.7 Standard Molar Entropy

NA75.30 J/mol.K

9.5 198.1

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