Chemicool

Mn

25

54.9380
Manganese
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
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

States
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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Energies
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

Reactions
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

Radius
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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Conductivity
thermal conductivity 7.81 J/m-sec-deg electrical conductivity 5.405 1/mohm-cm
polarizability 9.4 A^3

Abundance
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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