Strontium

Protactinium

Strontium Protactinium Comparison

Strontium

Protactinium

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1 Periodic Table

1.1 Symbol

1.2 Group Number

2NA

0 17

1.3 Period Number

2 7

1.4 Block

s block

f block

1.5 Element Family

Alkaline Earth

Actinide

1.6 CAS Number

74402467440133

7429905 54386242

1.7 Space Group Name

Fm_ 3m

I4/mmm

1.8 Space Group Number

225.00139.00

11 229

2 Facts

2.1 Interesting Facts

Strontium element is softer than Calcium.
Silvery Strontium turns yellow, if exposed to air.

Protactinium metal has 29 isotopes.
Isotopes of Protactinium-231 used in nuclear weapon.

2.2 Sources

Found in Minerals, Mining, Ores of Minerals

Found in Uranium Ores, Mining, Ores of metals

2.3 History

2.3.1 Who Discovered

William Cruickshank

William Crookes

2.3.2 Discovery

In 1787

In 1900

2.4 Abundance

2.4.1 Abundance In Universe

4 * 10^-6 %NA

5E-09 0.11

2.4.2 Abundance In Sun

~0.000005 %~-9999 %

1E-08 0.1

2.4.3 Abundance In Meteorites

0.00 %NA

1.7E-07 22

2.4.4 Abundance In Earth's Crust

0.04 %0.00 %

9.9E-12 8.1

2.4.5 Abundance In Oceans

0.00 %0.00 %

2E-23 1.1

2.4.6 Abundance In Humans

0.00 %NA

1E-13 1.4

3 Uses

3.1 Uses & Benefits

Strontium metal is used to producing ferrite magnets as well as refining zinc.
By-product of nuclear reactors called Strontium-90 is a radioactive isotope; it is absorbed by tissues and destroys bone marrow and cancer growth.

Currently known uses of Protactinium metal are limited to research purpose only.

3.1.1 Industrial Uses

Ammunition Industry, Chemical Industry

3.1.2 Medical Uses

3.1.3 Other Uses

Alloys

3.2 Biological Properties

3.2.1 Toxicity

Non Toxic

Highly Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

0.03 Blood/mg dm-30.00 Blood/mg dm-3

0 1970

3.2.4 In Bone

140.00 p.p.m.0.00 p.p.m.

0 170000

4 Physical

4.1 Melting Point

769.00 °C1,568.00 °C

27 3410

4.2 Boiling Point

1,384.00 °C4,027.00 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silvery White

Silver

4.3.3 Luster

Metallic

4.4 Hardness

4.4.1 Mohs Hardness

1.50NA

0.2 8.5

4.4.2 Brinell Hardness

NANA

0.14 3490

4.4.3 Vickers Hardness

NANA

121 3430

4.5 Speed of Sound

NANA

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

2727

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

0.951.50

0.7 2.54

5.3.2 Sanderson Electronegativity

0.72NA

0.22 2.56

5.3.3 Allred Rochow Electronegativity

0.991.14

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

1.00NA

0.62 2.48

5.3.5 Allen Electronegativity

0.96NA

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

3.052.50

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

549.50 kJ/mol568.00 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

1,064.20 kJ/mol1,128.00 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

4,138.00 kJ/mol1,814.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

5,500.00 kJ/mol2,991.00 kJ/mol

2780 37066

5.5.5 5th Energy Level

6,910.00 kJ/molNA

4305.2 97510

5.5.6 6th Energy Level

8,760.00 kJ/molNA

5715.8 105800

5.5.7 7th Energy level

10,230.00 kJ/molNA

7226.8 114300

5.5.8 8th Energy Level

11,800.00 kJ/molNA

8857.4 125300

5.5.9 9th Energy Level

15,600.00 kJ/molNA

14110 134700

5.5.10 10th Energy Level

17,100.00 kJ/molNA

17100 144300

5.5.11 11th Energy Level

31,270.00 kJ/molNA

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

1.64 g/amp-hr1.72 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

2.59 eVNA

2.14 5.65

5.8 Other Chemical Properties

Ionization, Radioactive Isotopes, Radioactivity, Solubility

Ionization, Radioactive Isotopes, Radioactivity

6 Atomic

6.1 Atomic Number

3891

3 117

6.2 Electron Configuration

[Kr] 5s²

[Rn] 5f² 6d¹ 7s²

6.3 Crystal Structure

Face Centered Cubic (FCC)

Tetragonal (TETR)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

3891

3 117

6.4.2 Number of Neutrons

50122

4 184

6.4.3 Number of Electrons

3891

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

215.00 pm163.00 pm

112 265

6.5.2 Covalent Radius

195.00 pm200.00 pm

96 260

6.5.3 Van der Waals Radius

249.00 pm243.00 pm

139 348

6.6 Atomic Weight

87.62 amu231.04 amu

6.94 294

6.7 Atomic Volume

33.70 cm3/mol15.00 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

25.70 (-eV)92.00 (-eV)

8 392.42

6.10 Lattice Constant

608.49 pm392.50 pm

228.58 891.25

6.11 Lattice Angles

π/2, π/2, π/2

6.12 Lattice C/A Ratio

NANA

1.567 1.886

7 Mechanical

7.1 Density

7.1.1 Density At Room Temperature

2.64 g/cm³15.37 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

2.38 g/cm3NA

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

121.00 (Pa)NA

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

6.03 GPaNA

1.3 222

7.5.2 Bulk Modulus

NANA

1.6 462

7.5.3 Young's Modulus

15.70 GPaNA

1.7 528

7.6 Poisson Ratio

0.28NA

0.032 0.47

7.7 Other Mechanical Properties

Unknown

8 Magnetic

8.1 Magnetic Characteristics

8.1.1 Specific Gravity

2.6415.37

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

Conductor

8.2.2 Resistivity

132.00 nΩ·m177.00 nΩ·m

0.18 961

8.2.3 Electrical Conductivity

0.08 10⁶/cm Ω0.05 10⁶/cm Ω

0.00666 0.63

8.2.4 Electron Affinity

5.03 kJ/molNA

0 222.8

9 Thermal

9.1 Specific Heat

0.30 J/(kg K)0.12 J/(kg K)

0.11 3.6

9.2 Molar Heat Capacity

26.40 J/mol·KNA

16.443 62.7

9.3 Thermal Conductivity

35.40 W/m·K47.00 W/m·K

6.3 429

9.4 Critical Temperature

NANA

26.3 3223

9.5 Thermal Expansion

22.50 µm/(m·K)9.90 µm/(m·K)

4.5 97

9.6 Enthalpy

9.6.1 Enthalpy of Vaporization

150.00 kJ/molNA

7.32 799.1

9.6.2 Enthalpy of Fusion

9.16 kJ/mol12.34 kJ/mol

2.1 35.23

9.6.3 Enthalpy of Atomization

163.20 kJ/molNA

61.5 837

9.7 Standard Molar Entropy

55.00 J/mol.K198.10 J/mol.K

9.5 198.1

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