Francium

Samarium

Francium Samarium Comparison

Francium

Samarium

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1 Periodic Table

1.1 Symbol

1.2 Group Number

1NA

0 17

1.3 Period Number

2 7

1.4 Block

s block

f block

1.5 Element Family

Alkali

Lanthanide

1.6 CAS Number

74407357440199

7429905 54386242

1.7 Space Group Name

Not Available

R_ 3m

1.8 Space Group Number

NA166.00

11 229

2 Facts

2.1 Interesting Facts

223 Francium has the longest half life at 21.8.
Francium metal is produced by alpha decay in ²²⁷Actinium 227.

Samarium metals helps stimulating body metabolism.
Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.

2.2 Sources

Formed by Decay Process, Mining

Found in Minerals, Mining, Ores of Minerals

2.3 History

2.3.1 Who Discovered

Marguerite Perey

Lecoq de Boisbaudran

2.3.2 Discovery

In 1939

In 1879

2.4 Abundance

2.4.1 Abundance In Universe

NA5 * 10^-7 %

5E-09 0.11

2.4.2 Abundance In Sun

~-9999 %~0.0000001 %

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

Francium has no known uses as it has a half life of only 22 minutes.

Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.

Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.

3.1.1 Industrial Uses

Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry

3.1.2 Medical Uses

3.1.3 Other Uses

Alloys, In Nuclear Reactors

3.2 Biological Properties

3.2.1 Toxicity

Slightly Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

0.00 Blood/mg dm-30.01 Blood/mg dm-3

0 1970

3.2.4 In Bone

0.00 p.p.m.NA

0 170000

4 Physical

4.1 Melting Point

27.00 °C1,072.00 °C

27 3410

4.2 Boiling Point

677.00 °C1,900.00 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silvery White

4.3.3 Luster

Lustrous

4.4 Hardness

4.4.1 Mohs Hardness

NANA

0.2 8.5

4.4.2 Brinell Hardness

NA441.00 MPa

0.14 3490

4.4.3 Vickers Hardness

NA412.00 MPa

121 3430

4.5 Speed of Sound

NA2,130.00 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

3330

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

0.701.17

0.7 2.54

5.3.2 Sanderson Electronegativity

NANA

0.22 2.56

5.3.3 Allred Rochow Electronegativity

0.861.07

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

0.68NA

0.62 2.48

5.3.5 Allen Electronegativity

0.67NA

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

3.302.83

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

380.00 kJ/mol544.50 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

NA1,070.00 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

NA2,260.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

NA3,990.00 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

8.32 g/amp-hr1.87 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

NA2.70 eV

2.14 5.65

5.8 Other Chemical Properties

Ionization, Radioactive Isotopes, Radioactivity, Solubility

Ionization, Radioactive Isotopes

6 Atomic

6.1 Atomic Number

8762

3 117

6.2 Electron Configuration

[Rn] 7s¹

[Xe] 4f⁶ 6s²

6.3 Crystal Structure

Body Centered Cubic (BCC)

Rhombohedral (RHO)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

8762

3 117

6.4.2 Number of Neutrons

13688

4 184

6.4.3 Number of Electrons

8762

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

NA180.00 pm

112 265

6.5.2 Covalent Radius

260.00 pm198.00 pm

96 260

6.5.3 Van der Waals Radius

348.00 pm229.00 pm

139 348

6.6 Atomic Weight

223.00 amu150.36 amu

6.94 294

6.7 Atomic Volume

NA19.95 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

8.00 (-eV)44.80 (-eV)

8 392.42

6.10 Lattice Constant

NA362.10 pm

228.58 891.25

6.11 Lattice Angles

π/2, π/2, 2 π/3

6.12 Lattice C/A Ratio

NANA

1.567 1.886

7 Mechanical

7.1 Density

7.1.1 Density At Room Temperature

1.87 g/cm³7.52 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

NA7.16 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

NA0.94 (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

NA19.50 GPa

1.3 222

7.5.2 Bulk Modulus

NA37.80 GPa

1.6 462

7.5.3 Young's Modulus

NA49.70 GPa

1.7 528

7.6 Poisson Ratio

NA0.27

0.032 0.47

7.7 Other Mechanical Properties

8 Magnetic

8.1 Magnetic Characteristics

8.1.1 Specific Gravity

NA7.52

0.53 4500

8.1.2 Magnetic Ordering

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

Poor Conductor

Conductor

8.2.2 Resistivity

3.00 nΩ·m0.94 nΩ·m

0.18 961

8.2.3 Electrical Conductivity

0.03 10⁶/cm Ω0.01 10⁶/cm Ω

0.00666 0.63

8.2.4 Electron Affinity

NA50.00 kJ/mol

0 222.8

9 Thermal

9.1 Specific Heat

NA0.20 J/(kg K)

0.11 3.6

9.2 Molar Heat Capacity

NA29.54 J/mol·K

16.443 62.7

9.3 Thermal Conductivity

15.00 W/m·K13.30 W/m·K

6.3 429

9.4 Critical Temperature

NANA

26.3 3223

9.5 Thermal Expansion

NA12.70 µm/(m·K)

4.5 97

9.6 Enthalpy

9.6.1 Enthalpy of Vaporization

NA166.40 kJ/mol

7.32 799.1

9.6.2 Enthalpy of Fusion

NA8.62 kJ/mol

2.1 35.23

9.6.3 Enthalpy of Atomization

71.00 kJ/mol209.00 kJ/mol

61.5 837

9.7 Standard Molar Entropy

NA69.60 J/mol.K

9.5 198.1

Compare All Metals

Francium vs Neptunium

Francium vs Actinium

Francium vs Einsteinium

All Metals