Fluorine Atomic Number

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Element Fluorine - F

2020-11-21 by Nick Connor Atomic Mass of Fluorine Atomic mass of Fluorine is 18.9984 u. Fluorine atoms have 9 electrons and the shell structure is 2.7. The ground state electron configuration of ground state gaseous neutral fluorine is He. 2p5 and the term symbol is 2P3/2. Click to see full answer Regarding this, what are the quantum numbers for fluorine?

Fluorine Atomic Number

Fluorine Atomic Number 17

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

Fluorine Menu

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Overview of Fluorine

  • Atomic Number: 9
  • Group: 17
  • Period: 2
  • Series: Halogens

Fluorine's Name in Other Languages

  • Latin: Fluorum
  • Czech: Fluor
  • Croatian: Fluor
  • French: Fluor
  • German: Fluor - r
  • Italian: Fluoro
  • Norwegian: Fluor
  • Portuguese: Flúor
  • Russian: Фтор
  • Spanish: Flúor
  • Swedish: Fluor

Atomic Structure of Fluorine

Fluorine atomic number 9
  • Atomic Radius: 0.57Å
  • Atomic Volume: 17.1cm3/mol
  • Covalent Radius: 0.72Å
  • Cross Section (Thermal Neutron Capture)σa/barns: 0.0096
  • Crystal Structure: Cubic
  • Electron Configuration:
    1s2 2s2p5
  • Electrons per Energy Level: 2,7
    Shell Model
  • Ionic Radius: 1.33Å
  • Filling Orbital: 2p5
  • Number of Electrons (with no charge): 9
  • Number of Neutrons (most common/stable nuclide): 10
  • Number of Protons: 9
  • Oxidation States: -1
  • Valence Electrons: 2s2p5
    Electron Dot Model

Chemical Properties of Fluorine

  • Electrochemical Equivalent: 0.70883g/amp-hr
  • Electron Work Function:
  • Electronegativity: 3.98 (Pauling); 4.1 (Allrod Rochow)
  • Heat of Fusion: 0.2552kJ/mol
  • Incompatibilities:
    Water, nitric acid, oxidizers, organic compounds
  • Ionization Potential
    • First: 17.422
    • Second: 34.97
    • Third: 62.707
  • Valence Electron Potential (-eV): -10.1

Physical Properties of Fluorine

  • Atomic Mass Average: 18.9984
  • Boiling Point: 85.1K -188.05°C -306.49°F
  • Coefficient of lineal thermal expansion/K-1: N/A
  • Conductivity
    Thermal: 0.000279 W/cmK
  • Density: 1.696g/L @ 273K & 1atm
  • Description:
    Greenish-yellow gas of the Halogen family
  • Enthalpy of Atomization: 79.08 kJ/mole @ 25°C
  • Enthalpy of Fusion: 0.26 kJ/mole
  • Enthalpy of Vaporization: 3.31 kJ/mole
  • Flammablity Class: Non-flammable gas (extreme oxidizer)
  • Freezing Point:see melting point
  • Heat of Vaporization: 3.2698kJ/mol
  • Melting Point: 53.63K -219.52°C -363.14°F
  • Molar Volume: 17.1 cm3/mole
  • Optical Refractive Index: 1.000195
  • Physical State (at 20°C & 1atm): Gas
  • Realitive Gas Density (Air=1) = 1.31
  • Specific Heat: 0.82J/gK

Regulatory / Health

  • CAS Number
    • 7782-41-4 cryogenic liquid
  • UN/NA ID and ERG Guide Number
    • 1045 / 124 compressed
    • 9192 / 167 cryogenic liquid
  • RTECS: LM6475000
  • NFPA 704
    • Health:
    • Fire:
    • Reactivity:
    • Special Hazard: OxidizerOSHAPermissible Exposure Limit (PEL)
      • 1 ppm = 1.55mg/m3 @ 25°C & 1 atm
      • TWA: 0.1 ppm
    • OSHA PEL Vacated 1989
      • TWA: 0.1 ppm
    • NIOSHRecommended Exposure Limit (REL)
      • TWA: 0.1 ppm
      • IDLH: 25 ppm
    • Routes of Exposure: Inhalation; Skin and/or eye contact
    • Target Organs: Eyes, skin, respiratory system, liver, 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: 0.5
      • Bone/p.p.m: 2000-12,000
      • Liver/p.p.m: 0.22-7
      • Muscle/p.p.m: 0.05
      • Daily Dietary Intake: 0.3-0.5 mg
      • Total Mass In Avg. 70kg human: 2.6 g

    Who / Where / When / How

    • Discoverer: Henri Moissan
    • Discovery Location: Paris France
    • Discovery Year: 1886
    • Name Origin:
      Latin: fluo (flow).
    • Abundance of Fluorine:
      • 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): 0.000363
    • Sources of Fluorine:
      Found in the minerals fluorite (CaF2) and cryolite (Na2AlF6). Around 2,400 tons of fluorine gas and 4,700,000 tons of fluorite are produced each year. Primary mining areas are Canada, USA, UK, Russia, Mexico and Italy.
    • Uses of Fluorine:
      Combines more readily than any other element. Used in refrigerants and other chloro fluorocarbons. Also in toothpaste as sodium fluoride (NaF) and stannous fluoride (SnF2); also in Teflon.
    • Additional Notes:
      Fluorine gas is highly toxic and corrosive. Even exposure to low concentrations causes lung and eye irritation. Metal fluorides are also very toxic while organic fluorides are often quite harmless.

    Fluorine 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.

    Related Resources

    • Anatomy of the Atom
      Answers many questions regarding the structure of atoms.
    • Molarity, Molality and Normality
      Introduces stoichiometry and explains the differences between molarity, molality and normality.
    • Molar Mass Calculations and Javascript Calculator
      Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
    • Chemical Database
      This database focuses on the most common chemical compounds used in the home and industry.

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The Element Fluorine

[Click for Isotope Data]


Atomic Number: 9

Atomic Weight: 18.998403163

Fluorine Atomic Number And Atomic Mass

Melting Point: 53.53 K (-219.62°C or -363.32°F)

Boiling Point: 85.03 K (-188.12°C or -306.62°F)

Density: 0.001696 grams per cubic centimeter

Phase at Room Temperature: Gas

Element Classification: Non-metal

Period Number: 2

Group Number: 17

Fluorine Atomic Number 19

Fluorine atomic number and mass number

Group Name: Halogen

What's in a name? From the Latin and French words for flow, fluere.

Say what? Fluorine is pronounced as FLU-eh-reen or as FLU-eh-rin.

History and Uses:

Fluorine Atomic Numbers

Fluorine is the most reactive of all elements and no chemical substance is capable of freeing fluorine from any of its compounds. For this reason, fluorine does not occur free in nature and was extremely difficult for scientists to isolate. The first recorded use of a fluorine compound dates to around 1670 to a set of instructions for etching glass that called for Bohemian emerald (CaF2). Chemists attempted to identify the material that was capable of etching glass and George Gore was able to produce a small amount of fluorine through an electrolytic process in 1869. Unknown to Gore, fluorine gas explosively combines with hydrogen gas. That is exactly what happened in Gore's experiment when the fluorine gas that formed on one electrode combined with the hydrogen gas that formed on the other electrode. Ferdinand Frederic Henri Moissan, a French chemist, was the first to successfully isolate fluorine in 1886. He did this through the electrolysis of potassium fluoride (KF) and hydrofluoric acid (HF). He also completely isolated the fluorine gas from the hydrogen gas and he built his electrolysis device completely from platinum. His work was so impressive that he was awarded the Nobel Prize for chemistry in 1906. Today, fluorine is still produced through the electrolysis of potassium fluoride and hydrofluoric acid as well as through the electrolysis of molten potassium acid fluoride (KHF2).

Fluorine Atomic Number 9

Fluorine is added to city water supplies in the proportion of about one part per million to help prevent tooth decay. Sodium fluoride (NaF), stannous(II) fluoride (SnF2) and sodium monofluorophosphate (Na2PO3F) are all fluorine compounds added to toothpaste, also to help prevent tooth decay. Hydrofluoric acid (HF) is used to etch glass, including most of the glass used in light bulbs. Uranium hexafluoride (UF6) is used to separate isotopes of uranium. Crystals of calcium fluoride (CaF2), also known as fluorite and fluorspar, are used to make lenses to focus infrared light. Fluorine joins with carbon to form a class of compounds known as fluorocarbons. Some of these compounds, such as dichlorodifluoromethane (CF2Cl2), were widely used in air conditioning and refrigeration systems and in aerosol spray cans, but have been phased out due to the damage they were causing to the earth's ozone layer.

Estimated Crustal Abundance: 5.85×102 milligrams per kilogram

Estimated Oceanic Abundance: 1.3 milligrams per liter

Number of Stable Isotopes: 1 (View all isotope data)

Ionization Energy: 17.423 eV

Oxidation States: -1

Fluorine Atomic Number 9 Meaning

Electron Shell Configuration:


2s2 2p5

For questions about this page, please contact Steve Gagnon.