Arsenic Atomic Number

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  • Arsenic Electronic configuration. Electronic configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 3 Back to key information about the elementBack to key information.
  • Atomic Number of Arsenic Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. The chemical symbol for Arsenic is.

Arsenic is a grey-appearing chemical element (atomic number 33, symbol As in the periodic table) also termed a metalloid. Arsenic can exist in a metallic state in three forms (yellow, black, and gray; with gray predominating) and in ionic forms.

Element Arsenic - As

Comprehensive data on the chemical element Arsenic is provided on this page; including scores of properties, element names in many languages, most known nuclides of Arsenic. 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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Overview of Arsenic

Physical
  • Atomic Number: 33
  • Group: 15
  • Period: 4
  • Series: Metalloids (Nonmetal)

Arsenic's Name in Other Languages

  • Latin: Arsenicum
  • Czech: Arzen
  • Croatian: Arsen
  • French: Arsenic
  • German: Arsenic - r
  • Italian: Arsenico
  • Norwegian: Arsen
  • Portuguese: Arsênio
  • Russian: Мышьяк
  • Spanish: Arsénico
  • Swedish: Arsenik

Atomic Structure of Arsenic

Arsenic Atomic No

  • Atomic Radius: 1.33Å
  • Atomic Volume: 13.1cm3/mol
  • Covalent Radius: 1.2Å
  • Cross Section (Thermal Neutron Capture)σa/barns: 4.3
  • Crystal Structure: Rhombohedral
  • Electron Configuration:
    1s2 2s2p6 3s2p6d10 4s2p3
  • Electrons per Energy Level: 2,8,18,5
    Shell Model
  • Ionic Radius: 0.58Å
  • Filling Orbital: 4p3
  • Number of Electrons (with no charge): 33
  • Number of Neutrons (most common/stable nuclide): 42
  • Number of Protons: 33
  • Oxidation States:±3,5
  • Valence Electrons: 4s2p3
    Electron Dot Model

Chemical Properties of Arsenic

  • Electrochemical Equivalent: 0.93177g/amp-hr
  • Electron Work Function: 3.75eV
  • Electronegativity: 2.18 (Pauling); 2.2 (Allrod Rochow)
  • Heat of Fusion: 369.9kJ/mol
  • Incompatibilities:
    halogenated compounds, rhubidium, carbide
  • Ionization Potential
    • First: 9.81
    • Second: 18.633
    • Third: 28.351
  • Valence Electron Potential (-eV): 74

Arsenic Atomic Number And Mass

Physical Properties of Arsenic

  • Atomic Mass Average: 74.92159
  • Boiling Point: 876K 603°C 1117°F
  • Coefficient of lineal thermal expansion/K-1: 4.7E-6
  • Conductivity
    Electrical: 0.0345 106/cm Ω
    Thermal: 0.502 W/cmK
  • Density: 5.72g/cc @ 300K
  • Description:
    Gray brittle non-metal flakes.
  • Enthalpy of Atomization: 301.3 kJ/mole @ 25°C
  • Enthalpy of Fusion: 24.44 kJ/mole
  • Enthalpy of Vaporization: 34.76 kJ/mole
  • Flammablity Class:
  • Freezing Point:see melting point
  • Hardness Scale
    • Brinell: 1440 MN m-2
    • Mohs: 3.5
  • Heat of Vaporization: 34.76kJ/mol
  • Melting Point: 1081K 808°C 1486°F
  • Molar Volume: 13.08 cm3/mole
  • Optical Refractive Index: 1.001552
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.33J/gK

Regulatory / Health

  • CAS Number
    • 7740-38-2
  • UN/NA ID and ERG Guide Number
    • UN1557
  • RTECS: CG0525000
  • NFPA 704
    • Health: 3
    • Fire: 2
    • Reactivity:
    • Special Hazard:
  • OSHAPermissible Exposure Limit (PEL)
    • TWA: 0.5 mg/m3
  • OSHA PEL Vacated 1989
  • NIOSHRecommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
  • Target Organs: Skin, respiratory system, kidneys, central nervous system, liver, gastrointestinal tract, reproductive system
  • 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: 0.0017-0.09
    • Bone/p.p.m: 0.08-1.6
    • Liver/p.p.m: 0.023-1.61
    • Muscle/p.p.m: 0.009-0.65
    • Daily Dietary Intake: 0.04-1.4 mg
    • Total Mass In Avg. 70kg human: 0.5-15 mg

6.88 Grams Of Arsenic To Mass Percent

Who / Where / When / How

  • Discoverer: Alberts Magna
  • Discovery Location: Unknown
  • Discovery Year: 1250
  • Name Origin:
    Greek: arsenikos (male); Latin: arsenicum.
  • Abundance of Arsenic:
    • Earth's Crust/p.p.m.: 1.5
    • Seawater/p.p.m.:
      • Atlantic Suface: 0.00145
      • Atlantic Deep: 0.00153
      • Pacific Surface: 0.00145
      • Pacific Deep: 0.00175
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): N/A
  • Sources of Arsenic:
    Found in mispickel (arsenopyrite). Mainly produced as a by-product of refining certain sulfide ores. Annual world wide production is around 47,000 tons (As2O3).
  • Uses of Arsenic:
    Used as a deadly poison, in shotgun pellets, metal for mirrors, glass, lasers, light-emitting diodes (LED) and in semiconductors.
  • Additional Notes:
    Arsenic is a carcinogen, associated with lung cancer when inhaled. Contact with skin can result in skin cancer. Also damage to intestines and liver. Toxic when ingested. Found in pesticides and wood preservatives. It is naturally occurring in many household products. It may have been known to ancient civilizations, but was probably first isolated by Magnus who lived between 1193-1280. Many sources reference 1250 as the year of discovery but this may be speculation.

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References

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.

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  • Chemical Database
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Kenneth Barbalace. Periodic Table of Elements - Arsenic - As. EnvironmentalChemistry.com. 1995 - 2021. Accessed on-line: 4/24/2021
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