Manganese Atomic Number

  

Element Manganese - Mn

Comprehensive data on the chemical element Manganese is provided on this page; including scores of properties, element names in many languages, most known nuclides of Manganese. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

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The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). The number of protons determines how many electrons surround the nucleus, and it is the arrangement of these electrons that. Sources of Manganese: Most abundant ores are pyrolusite (MnO 2 ), psilomelane (BaH 2 O) 2 Mn 5 O 10 and rhodochrosite (MnCO 3 ). Annual world production is around 6,220,000 tons.

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Overview of Manganese

Isotope Of Manganese Atomic Number

  • Atomic Number: 25
  • Group: 7
  • Period: 4
  • Series: Transition Metals

Manganese (Mn) Atomic Data for Manganese (Mn) Atomic Number = 25 Atomic Weight = 54.93805 Reference E95: Isotope: Mass: Abundance: Spin: Mag Moment: 55 Mn: 54.938047: 100%: 5/2 +3.4687: Mn I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 2 6 S 5 /. Manganese Oxide (MnO) Manganese Sulfide (MnS) Potassium permanganate (KMnO 4) Interesting facts: It is an essential trace nutrient in all forms of life. Paints that were pigmented with manganese dioxide can be traced back 17,000 years. Manganese ore was first confused with magnetic iron ore. One source of manganese is in nodules on the ocean floor. The element atomic number and name are listed in the upper left. The upper right side shows the number of electrons in a neutral atom. Remember, a neutral atom contains the same number of protons and electrons. The isotope is defined by the number of neutrons in an atom, which might be equal to the number of protons—or not.

Manganese's Name in Other Languages

  • Latin: Manganum
  • Czech: Mangan
  • Croatian: Mangan
  • French: Manganese
  • German: Mangan - r
  • Italian: Manganese
  • Norwegian: Mangan
  • Portuguese: Manganês
  • Russian: Марганец
  • Spanish: Manganesio
  • Swedish: Mangan

Atomic Structure of Manganese

  • Atomic Radius: 1.79Å
  • Atomic Volume: 1.39cm3/mol
  • Covalent Radius: 1.17Å
  • Cross Section (Thermal Neutron Capture) σa/barns: 13.3
  • Crystal Structure: Cubic body centered
  • Electron Configuration:
    1s2 2s2p6 3s2p6d5 4s2
  • Electrons per Energy Level: 2,8,13,2
    Shell Model
  • Ionic Radius: 0.46Å
  • Filling Orbital: 3d5
  • Number of Electrons (with no charge): 25
  • Number of Neutrons (most common/stable nuclide): 30
  • Number of Protons: 25
  • Oxidation States: 7,6,4,2,3
  • Valence Electrons: 3d5 4s2
    Electron Dot Model

Chemical Properties of Manganese

  • Electrochemical Equivalent: 0.29282g/amp-hr
  • Electron Work Function: 4.1eV
  • Electronegativity: 1.55 (Pauling); 1.6 (Allrod Rochow)
  • Heat of Fusion: 12.05kJ/mol
  • Incompatibilities:
    Oxidizers
  • Ionization Potential
    • First: 7.435
    • Second: 15.64
    • Third: 33.667
  • Valence Electron Potential (-eV): 220

Physical Properties of Manganese

  • Atomic Mass Average: 54.93805
  • Boiling Point: 2235K 1962°C 3564°F
  • Coefficient of lineal thermal expansion/K-1: 22E-6
  • Conductivity
    Electrical: 0.00695 106/cm Ω
    Thermal: 0.0782 W/cmK
  • Density: 7.43g/cc @ 300K
  • Description:
    Silver-gray transition metal with a pinkish tinge.
  • Elastic Modulus:
    • Bulk: 120/GPa
    • Rigidity: 79.5/GPa
    • Youngs: 191/GPa
  • Enthalpy of Atomization: 280.3 kJ/mole @ 25°C
  • Enthalpy of Fusion: 14.64 kJ/mole
  • Enthalpy of Vaporization: 219.7 kJ/mole
  • Flammablity Class: Metal: Combustible Solid
  • Freezing Point:see melting point
  • Hardness Scale
    • Brinell: 196 MN m-2
    • Mohs: 6
  • Heat of Vaporization: 226kJ/mol
  • Melting Point: 1517K 1244°C 2271°F
  • Molar Volume: 7.35 cm3/mole
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.48J/gK
  • Vapor Pressure = [email protected]°C

Regulatory / Health

  • CAS Number
    • 7439-96-5
  • RTECS: 009275000 (metal)
  • OSHAPermissible Exposure Limit (PEL)
    • Ceiling: 5 mg/m3
  • OSHA PEL Vacated 1989
    • TWA: 1 mg/m3
    • Ceiling: 5 mg/m3
    • STEL: 3 mg/m3
  • NIOSHRecommended Exposure Limit (REL)
    • TWA: 1 mg/m3
    • STEL: 3 mg/m3
    • IDLH: 500 mg/m3
  • Routes of Exposure: Inhalation; Ingestion
  • Target Organs: Respiratory system, central nervous system, blood, kidneys
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: 0.0016-0.075
    • Bone/p.p.m: 0.2-100
    • Liver/p.p.m: 3.6-9.6
    • Muscle/p.p.m: 0.2-2.3
    • Daily Dietary Intake: 0.4-10 mg
    • Total Mass In Avg. 70kg human: 12 mg

Who / Where / When / How

Atomic Number For Manganese

  • Discoverer: Johann G. Gahn
  • Discovery Location: Stockholm Sweden
  • Discovery Year: 1774
  • Name Origin:
    Latin: mangnes (magnet); Ital. manganese.
  • Abundance of Manganese:
    • Earth's Crust/p.p.m.: 950
    • Seawater/p.p.m.:
      • Atlantic Suface: 0.0001
      • Atlantic Deep: 0.000096
      • Pacific Surface: 0.0001
      • Pacific Deep: 0.00004
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): 2.63
  • Sources of Manganese:
    Most abundant ores are pyrolusite (MnO2), psilomelane [(BaH2O)2Mn5O10] and rhodochrosite (MnCO3). Annual world production is around 6,220,000 tons. Primary mining areas are South Africa, Russia, Gabon, Australia, Brazil.
  • Uses of Manganese:
    Used in steel, batteries, axles, rail switches, safes, plows and ceramics.
  • Additional Notes:

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References

Manganese

A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Number

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