General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Manganese Symbol Mn
atomic number 25 Atomic weight 54.9380
Density @ 293 K 7.43 g/cm3 Atomic volume 1.39 cm3/mol
Group Trans. Met. discovered 1774


state (s, l, g) s
melting point 1517.2 K boiling point 2333 K
Heat of fusion 12.050 kJ/mol Heat of vaporization 226.0 kJ/mol
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1st ionization energy 717.4 kJ/mole electronegativity 1.55
2nd ionization energy 1509 kJ/mole electron affinity kJ/mole
3rd ionization energy 3248.3 kJ/mole Specific heat 0.48 J/gK
heat atomization 281 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,13,2 electron configuration [Ar] 3d5 4s2
minimum oxidation number -3 maximum oxidation number 7
min. common oxidation no. 0 max. common oxidation no. 7
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Appearance & Characteristics

structure special:complex (cubic) color gray-white
uses steel, dry cells(MnO2) toxicity
hardness 5 mohs characteristics hard, brittle


reaction with air mild, w/ht = Mn3O4, Mn3N2 reaction with 6M HCl mild, = H2, MnCl2
reaction with 6M HCl mild, = H2, MnCl2 reaction with 15M HNO3 mild, = Mn(NO3)2, NOx
reaction with 6M NaOH
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Other Forms

number of isotopes 1 hydride(s) none
oxide(s) MnO Mn3O4 Mn2O3 MnO2 Mn2O7 chloride(s) MnCl2


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 127 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) 89 pm ionic radius (3+ ion) 75.3 pm
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thermal conductivity 7.81 J/m-sec-deg electrical conductivity 5.405 1/mohm-cm
polarizability 9.4 A^3


source Pyrolusite,psilomelane(oxide) rel. abund. solar system 3.980 log
abundance earth's crust 3 log cost, pure 1.7 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.