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Mendelevium

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Mendelevium Quick Reference

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Notes

Symbol

Md

Atomic Number

101

Oxidation States

3

more common

2

less common with disagreement

1

unverified

Pauling Electronegativity

1.3

Electron Configuration

Orbital Occupancy

[Rn] 5f13 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2 5f13

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

2F7/2

see expanded configuration ...

Ionization Energies

I (1)

6.58 eV

Melting Point

1100.15 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

173 pm

double bond

139 pm

Quantity

Mendelevium Atomic Structure

Notes

Ionization Energies

I (1)

6.58 eV

Electron Binding Energies

K    (1s)

145526 ± 20 eV

LI   (2s)

 28387 ± 8 eV 

LII  (2p1/2)

 27438 ± 10 eV

LIII (2p3/2)

 21356 ± 7 eV 

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 5f13 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2 5f13

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

2F7/2

see expanded configuration ...

Fluorescence Yields

ωK

0.973

ωL1

0.272

ωL2

0.515

ωL3

0.588

Coster-Kronig Yields

F12

0.02 

F13

0.53 

F23

0.191

Quantity

Mendelevium Physical Properties

Notes

Physical Form

solid metal

Quantity

Mendelevium Atomic Interaction

Notes

Oxidation States

3

more common

2

less common with disagreement

1

unverified

Pauling Electronegativity

1.3

Allred-Rochow Electronegativity

1.2

Nagle Electronegativity

1.17

Quantity

Mendelevium Thermodynamics

Notes

Melting Point

1100.15 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Quantity

Mendelevium Identification

Notes

CAS Number

7440-11-1

Quantity

Mendelevium Atomic Size

Notes

Orbital Radius

152.7 pm

Pyykkö Covalent Radius

single bond

173 pm

double bond

139 pm

Quantity

Mendelevium History

Notes

Discovery

date of discovery

1955

discoverer

Albert Ghiorso

birth

July 15, 1915

discoverer

Bernard G. Harvey

discoverer

Gregory R. Choppin

discoverer

Stanley G. Thompson

death

July 16, 1976

discoverer

Glenn Theodore Seaborg

birth

April 19, 1912

death

February 25, 1999

location of discovery

Berkeley, California

Origin of Element Name

origin

Dmitrii I. Mendeleev

origin description

person—Russian chemist who first devised and published the periodic table

Origin of Element Symbol

symbol: Md

origin

mendelevium

origin description

element name

Formerly Used or Proposed Element Names and Symbols

symbol

Mv

name

unnilunium

matching symbol

Unu

Quantity

Mendelevium Nomenclature

Notes

Element Names in Other Languages

French

mendelévium

German

Mendelevium

Italian

mendelevio

Spanish

mendelevio

Portuguese

mendelévio

Anions or Anionic Substituent Groups

mendelevide

Cations or Cationic Substituent Groups

mendelevium

Ligands

mendelevido

Heteroatomic Anion

mendelevate

'a' Term—Substitutive Nomenclature

mendeleva

'y' Term—Chains and Rings Nomenclature

mendelevy

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

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

Cox, P. A. The Elements: Their Origin, Abundance and Distribution. Oxford: Oxford University Press, 1989.

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.

Ghiorso, A., B. G. Harvey, G. R. Choppin, S. G. Thompson, and G. T. Seaborg. "New Element Mendelevium, Atomic Number 101." Physical Review, volume 98, number 5, 1955, pp. 1518–1519. doi:10.1103/PhysRev.98.1518

Ghiorso, A., S. G. Thompson, G. H. Higgins, G. T. Seaborg, M. H. Studier, P. R. Fields, S. M. Fried, H. Diamond, J. F. Mech, G. L. Pyle, J. R. Huizenga, A. Hirsch, W. M. Manning, C. I. Browne, H. L. Smith, and R. W. Spence. "New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100." Physical Review, volume 99, number 3, 1955, pp. 1048–1049. doi:10.1103/PhysRev.99.1048

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

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.

Hoffman, Darleane C., Albert Ghiorso, and Glenn T. Seaborg. The Transuranium People: The Inside Story. London, England: Imperial College Press, 2000.

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.

Indelicato, P., J. P. Santos, S. Boucard, and J.-P. Desclaux. "QED and Relativistic Corrections in Superheavy Elements." The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics, volume 45, number 1, 2007, pp. 155–170. doi:10.1140/epjd/e2007-00229-y

Jr., Elbert J. Little,, and Mark M. Jones. "A Complete Table of Electronegativities." Journal of Chemical Education, volume 37, number 5, 1960, pp. 231–233. doi:10.1021/ed037p231

Kaltsoyannis, Nikolas, and Peter Scott. The f Elements. Oxford: Oxford University Press, 1999.

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.

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

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

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

Nobel Foundation. Glenn T. Seaborg: The Nobel Prize in Chemistry 1951. http://nobelprize.org/nobel_prizes/chemistry/laureates/1951/seaborg-bio.html. Accessed on July 1, 2009.

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

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

Porter, F.T., and M. S. Freedman. "Recommended Atomic Electron Binding Energies, 1s to 6p3/2, for the Heavy Elements, Z = 84 to 103." Journal of Physical and Chemical Reference Data, volume 7, number 4, 1978, pp. 1267–1284.

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

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

Seaborg, Glenn T., and Walter D. Loveland. The Elements Beyond Uranium. New York: John Wiley & Sons, Inc., 1990.

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

Thompson, S. G., A. Ghiorso, and G. T. Seaborg. "The New Element Berkelium (Atomic Number 97)." Physical Review, volume 80, number 5, 1950, pp. 781–789. doi:10.1103/PhysRev.80.781

Thompson, S. G., K. Street, Jr., A. Ghiorso, and G. T. Seaborg. "The New Element Californium (Atomic Number 98)." Physical Review, volume 80, number 5, 1950, pp. 790–796. doi:10.1103/PhysRev.80.790

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

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

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

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