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Strontium Quick Reference

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Notes

Symbol

Sr

Atomic Number

38

Atomic Weight

Rounded

87.62

for regular calculations

Standard

87.62 ± 0.01

for precise calculations

Oxidation States

2

Pauling Electronegativity

0.95

Electron Configuration

Orbital Occupancy

[Kr] 5s2

[Kr] represents the closed-shell electron configuration of krypton

Orbital Filling Order

[Kr] 5s2

[Kr] represents the closed-shell electron configuration of krypton

Term Symbol

1S0

see expanded configuration ...

Ionization Energies

I   (1)

 5.69485 eV          

II  (2)

11.03019 ± 0.00012 eV

III (3)

42.88353 ± 0.00018 eV

IV  (4)

56.279 ± 0.003 eV    

see all 38 energies ...

Electron Affinity

0.05206 ± 0.00006 eV

  419.9 ± 0.5 cm-1  

Density

liquid, 1050.15 K

2.375 g/ml 

solid, 25 °C

2.640 g/cm3

Molar Volume

solid, 298 K, 1 atm

33.94 cm3/mol

Melting Point

1 bar

1050 ± 10 K

Boiling Point

1 atm

1655.15 K

Thermal Conductivity

solid

400 K, polycrystalline

31.7 W/(m K)

estimated

300 K, polycrystalline

35.3 W/(m K)

estimated

298.2 K, polycrystalline

35.4 W/(m K)

estimated

273.2 K, polycrystalline

36.4 W/(m K)

estimated

200 K, polycrystalline

40.5 W/(m K)

estimated

see all 14 conductivities ...

Pyykkö Covalent Radius

single bond

185 pm

double bond

157 pm

triple bond

139 pm

Atomic Radius

215 pm

Enthalpy of Fusion

1 atm

6.16 kJ/mol

Enthalpy of Vaporization

1 atm

138.91 kJ/mol

Quantity

Strontium Atomic Structure

Notes

Ionization Energies

I   (1)

 5.69485 eV          

II  (2)

11.03019 ± 0.00012 eV

III (3)

42.88353 ± 0.00018 eV

IV  (4)

56.279 ± 0.003 eV    

see all 38 energies ...

Electron Affinity

0.05206 ± 0.00006 eV

  419.9 ± 0.5 cm-1  

Electron Binding Energies

K    (1s)

16105 eV  

LI   (2s)

 2216 eV  

LII  (2p1/2)

 2007 eV  

LIII (2p3/2)

 1940 eV  

see all 12 energies ...

Electron Configuration

Orbital Occupancy

[Kr] 5s2

[Kr] represents the closed-shell electron configuration of krypton

Orbital Filling Order

[Kr] 5s2

[Kr] represents the closed-shell electron configuration of krypton

Term Symbol

1S0

see expanded configuration ...

Clementi-Raimondi Effective Nuclear Charge

1s

Orbital Exponent

37.1911

ζ

Principle Quantum Number

1

n

Effective Nuclear Charge

37.1911

Zeff = ζ × n

2s

Orbital Exponent

13.9509

ζ

Principle Quantum Number

2

n

Effective Nuclear Charge

27.9018

Zeff = ζ × n

see all 9 effective nuclear charges ...

Screening Percentage

92.5%

Fluorescence Yields

ωK

0.696 

ωL1

0.0051

ωL2

0.024 

ωL3

0.026 

Coster-Kronig Yields

F12

0.27 

F13

0.52 

F23

0.087

Quantity

Strontium Physical Properties

Notes

Density

liquid, 1050.15 K

2.375 g/ml 

solid, 25 °C

2.640 g/cm3

Molar Mass

Rounded

87.62 g/mol

for regular calculations

Standard

87.62 ± 0.01 g/mol

for precise calculations

Molar Volume

solid, 298 K, 1 atm

33.94 cm3/mol

Physical Form

silvery-white metal

Linear Thermal Expansion Coefficient

25 °C

22.5×10-6 K-1

Young's Modulus

15.7 GPa

Poisson's Ratio

0.280

Electrical Resistivity

α-strontium, solid

200 K

9.04×10-8 Ohm m

273.15 K

12.3×10-8 Ohm m

293 K

13.2×10-8 Ohm m

300 K

13.5×10-8 Ohm m

400 K

17.8×10-8 Ohm m

see all 46 resistivities ...

Photoelectric Work Function

2.74 eV

Superconducting Transition Temperature

50 GPa

7 K

maximum temperature

Mineralogical Hardness

1.5

Isothermal Bulk Modulus

300 K

11.6 GPa

Isothermal Compressibility

300 K

0.0862 GPa-1

Gram Atomic Volume

34 cm3

Quantity

Strontium Atomic Interaction

Notes

Oxidation States

2

Pauling Electronegativity

0.95

Mulliken-Jaffe Electronegativity

hybridsp

1.00

Sanderson Electronegativity

0.721

Allred-Rochow Electronegativity

0.99

Configuration Energy

electron volt units

5.695 eV

Pauling units

0.963   

Allen Electronegativity

0.963

Allred Electronegativity

oxidation state: 2

0.95

Ghosh-Gupta Electronegativity

2.5849 eV

Nagle Electronegativity

1.06

Pearson Absolute Electronegativity

2.0 eV

Smith Electronegativity

oxidation state: 2

1.0

Free Electron Fermi Surface Parameters

300 K

electron concentration

3.56×1022 cm-3

radius parameter

3.56

fermi wavevector

1.02×108 cm-1

fermi velocity

1.18×108 cm/s

fermi energy

3.95 eV

fermi temperature

4.58×104 K

Chemical Hardness

3.7 eV

Cohesive Energy

per mole

166 kJ/mol    

per atom

  1.72 eV/atom

Quantity

Strontium Thermodynamics

Notes

Melting Point

1 bar

1050 ± 10 K

Boiling Point

1 atm

1655.15 K

Thermal Conductivity

solid

400 K, polycrystalline

31.7 W/(m K)

estimated

300 K, polycrystalline

35.3 W/(m K)

estimated

298.2 K, polycrystalline

35.4 W/(m K)

estimated

273.2 K, polycrystalline

36.4 W/(m K)

estimated

200 K, polycrystalline

40.5 W/(m K)

estimated

see all 14 conductivities ...

Critical Point

3059 K

Vapor Pressure

1373 °C

100 kPa

1072 °C

10 kPa

866 °C

1 kPa

see all 15 pressures ...

Enthalpy of Fusion

1 atm

6.16 kJ/mol

Enthalpy of Vaporization

1 atm

138.91 kJ/mol

Isobaric Molar Heat Capacity

298.15 K, 1 bar

26.79 J/(mol K)

Isobaric Specific Heat Capacity

298.15 K, 1 bar

0.306 J/(g K)

Electronic Heat Capacity Coefficient

3.64 mJ/(mol K2)

Debye Temperature

Low Temperature Limit ( 0 K )

147 K

Room Temperature ( 298 K )

148 K

Quantity

Strontium Identification

Notes

CAS Number

7440-24-6

ICSC Number

powder

1534

RTECS Number

WK7700000

Quantity

Strontium Atomic Size

Notes

Atomic Radius

215 pm

Orbital Radius

183.6 pm

Pyykkö Covalent Radius

single bond

185 pm

double bond

157 pm

triple bond

139 pm

Cordero Covalent Radius

195 pm

Shannon-Prewitt Crystal Radius

ion charge: +2

coordination number: 6

132 pm

coordination number: 7

135 pm

coordination number: 8

140 pm

coordination number: 9

145 pm

coordination number: 10

150 pm

coordination number: 12

158 pm

Shannon-Prewitt Effective Ionic Radius

ion charge: +2

coordination number: 6

118 pm

coordination number: 7

121 pm

coordination number: 8

126 pm

coordination number: 9

131 pm

coordination number: 10

136 pm

coordination number: 12

144 pm

Pauling Empirical Crystal Radius

ion charge: +2

113 pm

Pauling Univalent Radius

ion charge: +1

132 pm

Batsanov Crystallographic Van Der Waals Radius

255 pm

Batsanov Equilibrium Van Der Waals Radius

294 pm

Slater Atomic-Ionic Radius

200 pm

Quantity

Strontium Crystal Structure

Notes

Allotropes

allotrope

α-strontium

symbol

αSr

allotrope

β-strontium

symbol

βSr

allotrope

β'-strontium

symbol

β'Sr

alternate symbol

Sr-II

Nearest Neighbor Distance

300 K, 1 atm

430 pm

Atomic Concentration

300 K, 1 atm

1.78×1022 cm-3

Quantity

Strontium History

Notes

Discovery

date of discovery

1808

discoverer

Humphry Davy

birth

December 17, 1778

death

May 29, 1829

location of discovery

London, England

Origin of Element Name

origin

Strontian

origin description

place—A city in Scotland

Origin of Element Symbol

symbol: Sr

origin

strontium

origin description

element name

Quantity

Strontium Abundances

Notes

Earth's Crust

3.70×102 ppm

Earth's Mantle

20.3 ppm

primitive mantle

Bulk Earth

13 ppm

Ocean Water

8.5 ppm

Metalliferous Ocean Sediment

Basal

351 ppm

River Water

0.050 ppm

U.S. Coal

130 ppm

Human Body

320 mg

based on a 70 kg "reference man"

Human Bone

36 ppm to 140 ppm

Human Hair

0.05 ppm to 0.9 ppm

Human Kidney

0.15 ppm to 1.5 ppm

Human Liver

0.05 ppm to 0.36 ppm

Human Muscle

0.12 ppm to 0.35 ppm

Human Nail

0.02 ppm to 0.65 ppm

Ferns

13 ppm

Solar System

23.5

number of atoms for every 106 atoms of silicon

Sun

2.92 ± 0.05

base 10 log of the number of atoms for every 1012 atoms of hydrogen

Meteorites

2.89 ± 0.02

base 10 log of the number of atoms for every 1012 atoms of hydrogen

Quantity

Strontium Nomenclature

Notes

Element Names in Other Languages

French

strontium

German

Strontium

Italian

stronzio

Spanish

estroncio

Portuguese

estrôncio

Anions or Anionic Substituent Groups

strontide

Cations or Cationic Substituent Groups

strontium

Ligands

strontido

Heteroatomic Anion

strontate

'a' Term—Substitutive Nomenclature

stronta

'y' Term—Chains and Rings Nomenclature

stronty

References    (Click the button next to a value above to see complete citation information for that entry)

Albright, Thomas A., and Jeremy K. Burdett. Problems in Molecular Orbital Theory. New York: Oxford University Press, 1992.

Allen, Leland C. "Electronegativity Is the Average One-Electron Energy of the Valence-Shell Electrons in Ground-State Free Atoms." Journal of the American Chemical Society, volume 111, number 25, 1989, pp. 9003–9014. doi:10.1021/ja00207a003

Allred, A. L. "Electronegativity Values from Thermochemical Data." Journal of Inorganic and Nuclear Chemistry, volume 17, number 3-4, 1961, pp. 215–221. doi:10.1016/0022-1902(61)80142-5

Allred, A. L., and E. G. Rochow. "A Scale of Electronegativity Based on Electrostatic Force." Journal of Inorganic and Nuclear Chemistry, volume 5, number 4, 1958, pp. 264–268. doi:10.1016/0022-1902(58)80003-2

Anders, Edward, and Nicolas Grevesse. "Abundances of the Elements: Meteoritic and Solar." Geochimica et Cosmochimica Acta, volume 53, number 1, 1989, pp. 197–214. doi:10.1016/0016-7037(89)90286-X

Andersen, T., H. K. Haugen, and H. Hotop. "Binding Energies in Atomic Negative Ions: III." Journal of Physical and Chemical Reference Data, volume 28, number 6, 1999, pp. 1511–1533.

Batsanov, S. S. "Van der Waals Radii of Elements." Inorganic Materials, volume 37, number 9, 2001, pp. 871–885. See abstract

Berkovits, D, E. Boaretto, S. Ghelberg, O. Heber, and M. Paul. "Electron Affinity of Strontium." Physical Review Letters, volume 75, number 3, 1995, pp. 414–417. doi:10.1103/PhysRevLett.75.414

Bowen, H. J. M. Environmental Chemistry of the Elements. London: Academic Press, Inc., 1979.

Bratsch, Steven G. "Revised Mulliken Electronegativities: I. Calculation and Conversion to Pauling Units." Journal of Chemical Education, volume 65, number 1, 1988, pp. 34–41. doi:10.1021/ed065p34

Campbell, J. L. "Fluorescence Yields and Coster–Kronig Probabilities for the Atomic L Subshells." Atomic Data and Nuclear Data Tables, volume 85, number 2, 2003, pp. 291–315. doi:10.1016/S0092-640X(03)00059-7

Cardarelli, François. Materials Handbook: A Concise Desktop Reference, 2nd edition. London: Springer–Verlag, 2008.

Chase, Malcolm W., editor. JPCRD Monograph No. 9: NIST-JANAF Thermochemical Tables, (Part I and Part II). Woodbury, NY: American Chemical Society and the American Institute of Physics, 1998.

Chi, T. C. "Electrical Resistivity of Alkaline Earth Elements." Journal of Physical and Chemical Reference Data, volume 8, number 2, 1979, pp. 439–498.

Clementi, E., D. L. Raimondi, and W. P. Reinhardt. "Atomic Screening Constants from SCF Functions. II. Atoms with 37 to 86 Electrons." Journal of Chemical Physics, volume 47, number 4, 1967, pp. 1300–1307. doi:10.1063/1.1712084

Cohen, E. Richard, David R. Lide, and George L. Trigg, editors. AlP Physics Desk Reference, 3rd edition. New York: Springer-Verlag New York, Inc., 2003.

Connelly, Neil G., Ture Damhus, Richard M. Hartshorn, and Alan T. Hutton. Nomenclature of Inorganic Chemistry: IUPAC Recommendations 2005. Cambridge: RSC Publishing, 2005.

Cordero, Beatriz, Verónica Gómez, Ana E. Platero-Prats, Marc Revés, Jorge Echeverría, Eduard Cremades, Flavia Barragán, and Santiago Alvarez. "Covalent Radii Revisited." Dalton Transactions, number 21, 2008, pp 2832–2838. doi:10.1039/b801115j

Cronan, D. S. "Basal Metalliferous Sediments from the Eastern Pacific." Geological Society of America Bulletin, volume 87, number 6, 1976, pp. 928–934. doi:10.1130/0016-7606(1976)87<928:BMSFTE>2.0.CO;2

de Podesta, Michael. Understanding the Properties of Matter, 2nd edition. London: Taylor & Francis, 2002.

Debessai, M., J. J. Hamlin, and J. S. Schilling. "Comparison of the Pressure Dependences of Tc in the Trivalent d-Electron Superconductors Sc, Y, La, and Lu up to Megabar Pressures." Physical Review B, volume 78, number 6, 2008, pp. 064519–1 to 064519–10. doi:10.1103/PhysRevB.78.064519

Dronskowski, Richard. Computational Chemistry of Solid State Materials. Weinheim, Germany: WILEY-VCH Verlag GmbH & Co. KGaA, 2005.

Ebbing, Darrell D., and Steven D. Gammon. General Chemistry, 8th edition. Boston, MA: Houghton Mifflin Company, 2005.

Emsley, John. Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press, 2003.

Emsley, John. The Elements, 3rd edition. Oxford: Oxford University Press, 1998.

Firestone, Richard B. Table of Isotopes, 8th edition, volume 2. Edited by Virginia S. Shirley, with assistant editors Coral M. Baglin, S. Y. Frank Chu, and Jean Zipkin. New York: John Wiley & Sons, Inc., 1996.

Galasso, Francis S. Structure and Properties of Inorganic Solids. Oxford: Pergamon Press, 1970.

Ghosh, Dulal C., and Kartick Gupta. "A New Scale Of Electronegativity Of 54 Elements Of Periodic Table Based On Polarizability Of Atoms." Journal of Theoretical and Computational Chemistry, volume 5, number 4, 2006, pp. 895–911. doi:10.1142/S0219633606002726

Greenwood, N. N., and A. Earnshaw. Chemistry of the Elements, 2nd edition. Oxford: Butterworth-Heinemann, 1997.

Gwyn Williams. Electron Binding Energies. http://www.jlab.org/~gwyn/ebindene.html. Accessed on April 30, 2010.

Ho, C. Y., R. W. Powell, and P. E. Liley. "Thermal Conductivity of the Elements: A Comprehensive Review." Journal of Physical and Chemical Reference Data, volume 3, supplement 1, 1974, pp. I–1 to I–796.

Horvath, A. L. "Critical Temperature of Elements and the Periodic System." Journal of Chemical Education, volume 50, number 5, 1973, pp. 335–336. doi:10.1021/ed050p335

Huheey, James E., Ellen A. Keiter, and Richard L Keiter. Inorganic Chemistry: Principles of Structure and Reactivity, 4th edition. New York: HarperCollins College Publishers, 1993.

Ihde, Aaron J. The Development of Modern Chemistry. New York: Dover Publications, Inc., 1984.

International Labour Organization (ILO). International Chemical Safety Card for Strontium (Powder). http://www.ilo.org/legacy/english/protection/safework/cis/products/icsc/dtasht/_icsc15/icsc1534.htm. Accessed on May 4, 2010.

Kaxiras, Efthimios. Atomic and Electronic Structure of Solids. Cambridge: Cambridge University Press, 2003.

King, H. W. "Pressure-Dependent Allotropic Structures of the Elements." Bulletin of Alloy Phase Diagrams, volume 4, number 4, 1983, pp. 449–450. doi:10.1007/BF02868110

Kittel, Charles. Introduction to Solid State Physics, 8th edition. Hoboken, NJ: John Wiley & Sons, Inc, 2005.

Krause, M. O. "Atomic Radiative and Radiationless Yields for K and L Shells." Journal of Physical and Chemical Reference Data, volume 8, number 2, 1979, pp. 307–327.

Li, Y.-H., and J. E. Schoonmaker. "Chemical Composition and Mineralogy of Marine Sediments." pp. 1–36 in Sediments, Diagenesis, and Sedimentary Rocks. Edited by Fred T. Mackenzie. Oxford: Elsevier Ltd., 2005.

Liboff, Richard L. Introductory Quantum Mechanics, 3rd edition. Reading, MA: Addison Wesley Longman, Inc., 1998.

Lide, David R., editor. CRC Handbook of Chemistry and Physics, 88th edition. Boca Raton, Florida: Taylor & Francis Group, 2008.

Mann, Joseph B., Terry L. Meek, and Leland C. Allen. "Configuration Energies of the Main Group Elements." Journal of the American Chemical Society, volume 122, number 12, 2000, pp. 2780–2783. doi:10.1021/ja992866e

Manuel, O., editor. Origin of Elements in the Solar System: Implications of Post-1957 Observations. New York: Kluwer Academic Publishers, 2000.

Marshall, James L. Discovery of the Elements: A Search for the Fundamental Principles of the Universe, 2nd edition. Boston, MA: Pearson Custom Publishing, 2002.

Martin, W. C. "Electronic Structure of the Elements." The European Physical Journal C — Particles and Fields, volume 15, number 1–4, 2000, pp. 78–79. doi:10.1007/BF02683401

McDonough, W. F. "Compositional Model for the Earth's Core." pp. 547–568 in The Mantle and Core. Edited by Richard W. Carlson. Oxford: Elsevier Ltd., 2005.

Mechtly, Eugene A. "Properties of Materials." pp. 4–1 to 4–33 in Reference Data For Engineers: Radio, Electronics, Computer, and Communications. By Mac E. Van Valkenburg, edited by Wendy M. Middleton. Woburn, MA: Butterworth-Heinemann, 2002. doi:10.1016/B978-075067291-7/50006-6

Miessler, Gary L., and Donald A. Tarr. Inorganic Chemistry, 3rd edition. Upper Saddle River, NJ: Pearson Prentice Hall, 2004.

Nagle, Jeffrey K. "Atomic Polarizability and Electronegativity." Journal of the American Chemical Society, volume 112, number 12, 1990, pp. 4741–4747. doi:10.1021/ja00168a019

National Institute for Occupational Safety and Health (NIOSH). International Chemical Safety Card for Strontium (Powder). http://www.cdc.gov/niosh/ipcsneng/neng1534.html. Accessed on May 4, 2010.

National Institute for Occupational Safety and Health (NIOSH). The Registry of Toxic Effects of Chemical Substances for Strontium. http://www.cdc.gov/niosh-rtecs/wk757e20.html. Accessed on November 15, 2009.

Orem, W. H., and R. B. Finkelman. "Coal Formation and Geochemistry." pp. 191–222 in Sediments, Diagenesis, and Sedimentary Rocks. Edited by Fred T. Mackenzie. Oxford: Elsevier Ltd., 2005.

Oxtoby, David W., H. P. Gillis, and Alan Campion. Principles of Modern Chemistry, 6th edition. Belmont, CA: Thomson Brooks/Cole, 2008.

Palme, H., and Hugh St. C. O'Neill. "Cosmochemical Estimates of Mantle Composition." pp. 1–38 in The Mantle and Core. Edited by Richard W. Carlson. Oxford: Elsevier Ltd., 2005.

Pauling, Linus. The Nature of the Chemical Bond, 3rd edition. Ithaca, NY: Cornell University Press, 1960.

Pearson, Ralph G. "Absolute Electronegativity and Hardness: Application to Inorganic Chemistry." Inorganic Chemistry, volume 27, number 4, 1988, pp 734–740. doi:10.1021/ic00277a030

Pekka Pyykkö. Self-Consistent, Year-2009 Covalent Radii. http://www.chem.helsinki.fi/~pyykko/Radii09.pdf. Accessed on November 20, 2010.

Pyykkö, Pekka, and Michiko Atsumi. "Molecular Double-Bond Covalent Radii for Elements Li-E112." Chemistry - A European Journal, volume 15, number 46, 2009, pp. 12770–12779. doi:10.1002/chem.200901472

Pyykkö, Pekka, and Michiko Atsumi. "Molecular Single-Bond Covalent Radii for Elements 1-118." Chemistry - A European Journal, volume 15, number 1, 2009, pp. 186–197. doi:10.1002/chem.200800987

Pyykkö, Pekka, Sebastian Riedel, and Michael Patzschke. "Triple-Bond Covalent Radii." Chemistry - A European Journal, volume 11, number 12, 2005, pp. 3511–3520. doi:10.1002/chem.200401299

Ringnes, Vivi. "Origin of the Names of Chemical Elements." Journal of Chemical Education, volume 66, number 9, 1989, pp. 731–738. doi:10.1021/ed066p731

Rohrer, Gregory S. Structure and Bonding in Crystalline Materials. Cambridge: Cambridge University Press, 2001.

Samsonov, G. V., editor. Handbook of the Physicochemical Properties of the Elements. New York: Plenum Publishing Corporation, 1968.

Sanderson, R. T. Simple Inorganic Substances. Malabar, FL: Robert E. Krieger Publishing Co., Inc., 1989.

Sanderson, R. T. "Principles of Electronegativity: Part I. General Nature." Journal of Chemical Education, volume 65, number 2, 1988, pp. 112–118. doi:10.1021/ed065p112

Sanderson, R. T. Polar Covalence. New York: Academic Press, Inc., 1983.

Sansonetti, J. E. "Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Strontium Ions (Sr II–Sr XXXXVIII)." Journal of Physical and Chemical Reference Data, volume 41, number 1, 2012, pp. 013102–1 to 013102–119. doi:10.1063/1.3659413

Sansonetti, J. E., and W. C. Martin. "Handbook of Basic Atomic Spectroscopic Data." Journal Of Physical And Chemical Reference Data, volume 34, number 4, 2005, pp. 1559–2259. doi:10.1063/1.1800011

Scientific Group Thermodata Europe (SGTE). Pure Substances: Part 1—Elements and Compounds from AgBr to Ba3N2. Edited by I. Hurtado and D. Neuschütz. Berlin: Springer-Verlag, 1999. doi:10.1007/10652891_3

Shannon, R. D. "Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chalcogenides." Acta Crystallographica Section A, volume 32, number 5, 1976, pp. 751–767. doi:10.1107/S0567739476001551

Silbey, Robert J., Robert A. Alberty, and Moungi G. Bawendi. Physical Chemistry, 4th edition. Hoboken, NJ: John Wiley & Sons, Inc., 2005.

Singman, Charles N. "Atomic Volume and Allotropy of the Elements." Journal of Chemical Education, volume 61, number 2, 1984, pp. 137–142. doi:10.1021/ed061p137

Slater, J. C. "Atomic Radii in Crystals." The Journal of Chemical Physics, volume 41, number 10, 1964, pp. 3199–3204. doi:10.1063/1.1725697

Smith, Derek W. "Electronegativity in Two Dimensions: Reassessment and Resolution of the Pearson-Pauling Paradox." Journal of Chemical Education, volume 67, number 11, 1990, pp. 911–914. doi:10.1021/ed067p911

Smith, Derek W. Inorganic Substances: A Prelude to the Study of Descriptive Inorganic Chemistry. Cambridge: Cambridge University Press, 1990.

Stewart, G. R. "Measurement of low-temperature specific heat." Review of Scientific Instruments, volume 54, number 1, 1983, pp. 1–11. doi:10.1063/1.1137207

Stewart, G. R. "Measurement of Low-Temperature Specific Heat." Review of Scientific Instruments, volume 54, number 1, 1983, pp. 1–11. doi:10.1063/1.1137207

Tari, A. The Specific Heat of Matter at Low Temperatures. London: Imperial College Press, 2003.

Vainshtein, Boris K., Vladimir M. Fridkin, and Vladimir L. Indenbom. Structure of Crystals, 2nd edition. Modern Crystallography 2. Edited by Boris K. Vainshtein, A. A. Chernov, and L. A. Shuvalov. Berlin: Springer-Verlag, 1995.

Voigt, H. H., editor. Landolt–Börnstein—Group VI Astronomy and Astrophysics. Berlin: Springer–Verlag, 1993.

Waber, J. T., and Don T. Cromer. "Orbital Radii of Atoms and Ions." Journal of Chemical Physics, volume 42, number 12, 1965, pp. 4116–4123. doi:10.1063/1.1695904

Waldron, Kimberley A., Erin M. Fehringer, Amy E. Streeb, Jennifer E. Trosky, and Joshua J. Pearson. "Screening Percentages Based on Slater Effective Nuclear Charge as a Versatile Tool for Teaching Periodic Trends." Journal of Chemical Education, volume 78, number 5, 2001, pp. 635–639. doi:10.1021/ed078p635

Weeks, Mary Elvira, and Henry M. Leicester. Discovery of the Elements, 7th edition. Easton, PA: Journal of Chemical Education, 1968.

Wieser, Michael E., and Tyler B. Coplen. "Atomic weights of the elements 2009 (IUPAC Technical Report)." Pure and Applied Chemistry, volume 83, number 2, 2011, pp. 359–396. doi:10.1351/PAC-REP-10-09-14

Yaws, Carl L. "Liquid Density of the Elements." Chemical Engineering, volume 114, number 12, 2007, pp. 44–46.

Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Houston, TX: Gulf Publishing Company, 2005.