Argon Number Of Electrons

Posted : admin On 1/29/2022

The atomic number of argon is 18. So it has 18 protons and 18 electrons.There are 18 protons in argon, and that determines its chemical identity. And there are 18 electrons in the neutral atom of. The seven elements—helium, neon, argon, krypton, xenon, radon, and oganesson—of Group 18 of the periodic table. All of the noble gases are present in Earth’s atmosphere and are colorless, odorless, tasteless, and nonflammable. Learn more about noble gases with this article. Neutral atoms of argon (atomic number 18) have the same number of electrons as each of the following items except: Ne If the element sulfur, S, was to lose two electrons per atom, the net ion charge of each atom would be. A neutral atom has the same number of protons and electrons (charges cancel each other out). An ion has an unequal number of protons and electrons. If the charge is positive, there are more protons than electrons. If the charge is negative, electrons are in excess. You can find the number of neutrons if you know the isotope of the atom.

Element Argon - Ar

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

Argon Number Of Electrons

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Overview of Argon

  • Atomic Number: 18
  • Group: 18
  • Period: 3
  • Series: Noble Gasses

Argon's Name in Other Languages

  • Latin: Argon
  • Czech: Argon
  • Croatian: Argon
  • French: Argon
  • German: Argon - r
  • Italian: Argo
  • Norwegian: Argon
  • Portuguese: Argônio
  • Russian: Аргон
  • Spanish: Argón
  • Swedish: Argon

Argon Number Of Valence Electrons

Atomic Structure of Argon

  • Atomic Radius: 0.88Å
  • Atomic Volume: 28.5cm3/mol
  • Covalent Radius: 0.98Å
  • Cross Section (Thermal Neutron Capture)σa/barns: 0.675
  • Crystal Structure: Cubic face centered
  • Electron Configuration:
    1s2 2s2p6 3s2p6
  • Electrons per Energy Level: 2,8,8
    Shell Model
  • Ionic Radius:
  • Filling Orbital: 3p6
  • Number of Electrons (with no charge): 18
  • Number of Neutrons (most common/stable nuclide): 22
  • Number of Protons: 18
  • Oxidation States: 0
  • Valence Electrons: 3s2p6
    Electron Dot Model

Chemical Properties of Argon

  • Electrochemical Equivalent:
  • Electron Work Function:
  • Electronegativity: N/A (Pauling); 3.2 (Allrod Rochow)
  • Heat of Fusion: 1.188kJ/mol
  • Incompatibilities:
  • Ionization Potential
    • First: 15.759
    • Second: 27.629
    • Third: 40.74
  • Valence Electron Potential (-eV):

Physical Properties of Argon

  • Atomic Mass Average: 39.948
  • Boiling Point: 87.45K -185.7°C -302.3°F
  • Coefficient of lineal thermal expansion/K-1: N/A
  • Conductivity
    Thermal: 0.0001772 W/cmK
  • Density: 1.7824g/L @ 273K & 1atm
  • Description:
    Colorless, odorless, tasteless noble gas.
  • Enthalpy of Fusion: 1.18 kJ/mole
  • Enthalpy of Vaporization: 6.43 kJ/mole
  • Flammablity Class:
  • Freezing Point:see melting point
  • Heat of Vaporization: 6.447kJ/mol
  • Melting Point: 83.96K -189.19°C -308.54°F
  • Molar Volume: 24.2 cm3/mole
  • Optical Refractive Index: 1.000281
  • Physical State (at 20°C & 1atm): Gas
  • Specific Heat: 0.52J/gK

Regulatory / Health

  • CAS Number
    • 7440-37-1
  • UN/NA ID and ERG Guide Number
    • UN1006
  • RTECS: CF2300000
  • OSHAPermissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSHRecommended Exposure Limit (REL)
    • No limits set by NIOSH
  • 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: trace
    • Bone/p.p.m: nil
    • Liver/p.p.m: nil
    • Muscle/p.p.m: nil
    • Daily Dietary Intake: n/a
    • Total Mass In Avg. 70kg human: n/a

Who / Where / When / How

  • Discoverer: Sir William Ramsey, Lord Baron Rayleigh
  • Discovery Location: Bristol England (Ramsey)/London England (Rayleigh)
  • Discovery Year: 1894
  • Name Origin:
    Greek: Argos (inactive).
  • Abundance of Argon:
    • Earth's Crust/p.p.m.: 1.2
    • Seawater/p.p.m.: 0.45
    • Atmosphere/p.p.m.: 9300
    • Sun (Relative to H=1E12): 1000000
  • Sources of Argon:
    Argon makes up 1% of the air and is isolated by removing nitrogen, oxygen, carbon dioxide and water from air. Argon is constantly being formed from the radioactive decay of K-40 (an isotope of potassium). of radioactive potassium-40. World wide commercial production is around 700,000 tons per year.
  • Uses of Argon:
    Argon is used for lighting. It may also be used to provide an inert atmosphere for certain projects when explosion or other forms of oxidation may pose a problem. Also used in 'Geiger' counters, which measure radiation levels.
  • Additional Notes:

Argon Menu

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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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  • Molar Mass Calculations and Javascript Calculator
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  • Chemical Database
    This database focuses on the most common chemical compounds used in the home and industry.

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Kenneth Barbalace. Periodic Table of Elements - Argon - Ar. 1995 - 2021. Accessed on-line: 4/25/2021

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Argon Number Of Electrons

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