Fluorine (F) – Periodic Table (Element Information & More)

Fluorine (F) element Periodic table

This is a SUPER easy guide on Fluorine element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Fluorine element in Periodic table.)

So if you want to know anything about the Fluorine element, then this guide is for you.

Let’s dive right into it!

Fluorine Element (F) Information

Appearance of Fluorine Appearance of fluorine
Gaseous state: Pale yellow
Liquid state: Bright yellow
Alpha fluorine: Opaque
Beta fluorine: Transparent
State of Fluorine at STPGas
Position of Fluorine in Periodic tableFluorine in periodic table (Position)
Group: 17, Period: 2, Block: p
Category of Fluorine elementFluorine element category
Nonmetals (Halogens)
Atomic number of Fluorine, or 
Protons in Fluorine
Neutrons in Fluorine10
Electrons in Fluorine9
Symbol of Fluorine F
Atomic mass of Fluorine Fluorine (F) atomic mass
18.998 u
Electrons arrangement in Fluorine


Bohr model of Fluorine
Bohr model of Fluorine (Electrons arrangement in fluorine, F)
2, 7
Electronic configuration of Fluorine[He] 2s2 2p5
Atomic radius of FluorineFluorine (F) atomic radius
135 picometers (van der Waals radius)
Valence electrons in FluorineValence electrons in Fluorine (F)
1st Ionization energy of Fluorine17.423 eV
Electronegativity of Fluorine Electronegativity of Fluorine (F)
3.98 (Pauling scale)
Crystal structure of Fluorinecrystal structure of fluorine
SC (Simple cubic)
Melting point of Fluorine (F2)53.48 K or -219.67 °C or -363.41 °F
Boiling point of Fluorine (F2)85.03 K or -188.11 °C or -306.6 °F
Density of Fluorine1.696 g/L
Main isotope of Fluorine19F
Who discovered Fluorine and when?Who discovered Fluorine and when?
Andre-Marie Ampere in 1810
CAS number7782-41-4

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Fluorine in Periodic table

Fluorine element is in group 17 and period 2 of the Periodic table. Fluorine is the p-block element and it belongs to halogens group.

H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
*Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
**Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Why is Fluorine in Group 17?

Why is Fluorine in Group 17

Do you know, how many electrons can be accommodated in the first shell, second shell, third shell, fourth shell, etc…?

Here is the table showing the capacity of orbits to hold electrons. 

Number of electrons in shells.

Orbit / Shell (n)Maximum no. of electrons this orbit can hold
K shell, n = 12 × 1² = 2
L shell, n = 22 × 2² = 8
M shell, n = 32 × 3² = 18
N shell, n = 42 × 4² = 32


  • 1st shell can hold 2 electrons.
  • 2nd shell can hold 8 electrons.
  • 3rd shell can hold 18 electrons.
  • 4th shell can hold 32 electrons.

Now the atomic number of fluorine (F) is 9.

Hence the fluorine element has electrons arrangement 2, 7.

This electron arrangement indicates that the outermost orbit of fluorine element (F) has 7 electrons.

Hence, it lies in group 17.

Why is Fluorine in Period 2?

Why is Fluorine in Period 2

Let me ask you a question.

How many shells does fluorine have?

It’s 2. Right? 

You have already seen the bohr model of fluorine element in the above table.

From the Bohr model, it can be found that the number of orbits or shells in fluorine is 2. Hence, as fluorine has 2 orbits, it lies in period 2 of the Periodic table.

Why is Fluorine in p-block?

Why is Fluorine in p-block

I will explain the reason behind this, but first of all I want to ask you a simple question.

How can you determine the blocks-wise position of elements?

The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.

For example; the electron configuration of fluorine is [He] 2s2 2p5

So the last electron of fluorine enters the p-subshell or p-orbital. 

Hence, fluorine is the p-block element.

8 Interesting facts about fluorine 

Interesting facts about fluorine elements are mentioned below.

  1. Fluorine is the most electronegative element on the periodic table. That means fluorine atoms can attract electrons very rapidly as compared to other elements.
  2. The average amount of fluorine present in the human body is around 3 mg.
  3. Out of all the halogens present on the periodic table, fluorine is the lightest one having atomic mass 18.998 u.
  4. Fluorine is the 13th most abundant element found in the earth’s crust. It is not found naturally, but it always exists as a compound form with other elements as it is highly reactive.
  5. Although fluorine is the 13th abundant element in the earth’s crust, it is very rarely found in the universe.
  6. Amount of fluorine present in the universe is around 400 parts per billion.
  7. Fluorine element has only one stable isotope (i.e 19F), and it is highly sensitive to magnetic fields.
  8. Fluorine is obtained from its minerals fluorite (or fluorspar), which glows in the dark when they are exposed to the light.

Properties of fluorine

Physical and chemical properties of fluorine element are given below.

Physical properties of fluorine

The physical properties of fluorine element are listed below.

  • At STP, fluorine element exist as a light pale-yellow color gas.
  • In gaseous state, fluorine is a light pale-yellow color gas, while in a liquid state it is a bright yellow color gas.
  • Atomic mass of fluorine is 18.998 u, which makes it the lightest halogen on the periodic table.
  • Fluorine gas has a pungent smell.
  • Liquid fluorine is soluble in liquid oxygen and ozone.

Chemical properties of fluorine

The chemical properties of fluorine element are listed below.

  • Fluorine is a highly toxic and corrosive gas. And hence it was also called chemist killer.
  • Fluorine is a highly reactive element and hence it is always found with other elements in a compound form.
  • Fluorine is such a highly reactive element that it can also attack diamond.
  • Fluorine does not react with oxygen gas and other inert gases like helium, neon and krypton.
  • Fluorine is highly flammable and it also explosively reacts with water.

Uses of fluorine

Uses of fluorine element are listed below.

  • Sodium fluoride (NaF) is added to the toothpaste which helps in preventing dental cavities and tooth decay.
  • In manufacturing industries, Fluorine is used in the manufacturing of teflon.
  • Fluorine element is also present in the refrigerants (chlorofluorocarbon (CFC)) which are used in refrigerators, air conditioners, etc.
  • In the medical field, some drugs also contain fluorine in some proportion.
  • Compounds made of fluorine are used to process nuclear fuels.

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Chemical data: Wikipedia, Chemspider
Fluorine element: Image by Prof B. G. Mueller derivative work: TCO, CC BY-SA 3.0, via Wikimedia Commons
Andre-Marie Ampere: Image credits- Wikimedia commons

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