CH3F lewis structure, Characteristics: 13 Facts You Should Know


CH3F is the chemical formula for fluoromethane. It is also known as methyl fluoride.

Fluoromethane (CH3F) is the chemical compound contains one carbon atom, three hydrogen atoms and one fluorine atom. It is a flammable gas with no colour and quite heavier as compared to air. The smell of fluoromethane is same as like as ether.  This editorial is discussing about the CH3F lewis structure and characteristics.

How to draw CH3F lewis structure?

To draw the lewis structure of any molecule or chemical compound we should have to remember the sequence of some points as follows:

  • Count total valence electrons of the molecule
  • Least electronegative atom should be the central atom
  • Bonding between all the elements attached to central atom
  • Left over valence electrons has been shared within all bonding atoms to complete octet
  • Calculate lone pair electrons
  • Calculate formal charge present on the molecule.

In CH3F lewis structure, it has total three atoms present i.e. one C atom, one F atom and three H atoms. The electronegativity of C atom is 2.55 and hydrogen atom is 2.20 while electronegativity of fluorine atom is 3.98. Hydrogen atom can’t be the central atom as it has only one valence electron even if it has lowest electronegativity.

So, in CH3F molecule carbon atom is being a central atom as it is least electronegative than fluorine atom. After selecting the C atom as central atom, all the outer electrons gets linked with central atom by bonding and sharing electrons. Then calculate the total valence electrons present on CH3F molecule, and complete its outer element octets and count the formal charge.

ch3f lewis structure
CH3F molecule

CH3F valence electrons

In CH3F lewis structure, the carbon atom has four valence electrons as it have its place to 4th group in the periodic table. Similarly hydrogen atom has one valence electron and fluorine atom has seven valence electrons as they both have its place to the 1st and 7th group in the periodic table respectively. Hence total valence electrons present in the CH3F lewis structure is as follows:

Carbon atom’s valence electrons = 04

Fluorine atom’s valence electrons = 07

Hydrogen atom’s valence electrons = 1 x 3 (H)

CH3F lewis structure has total valence electrons = 4 (C) + 7 (F) + 3 (H) = 14

Thus, the total valence electrons in CH3F lewis structure are fourteen.

If we want to know the total electron pairs in CH3F lewis structure the divide the total valence electrons by two.

Therefore, total electron pairs in CH3F lewis structure = 14 / 2 = 7

Hence, total seven electron pairs are present in CH3F molecule.

Valence electrons on CH3F lewis structure

CH3F lewis structure octet rule

The CH3F lewis structure has total fourteen valence electrons present on it, from which eight electrons get participated in bonding between central carbon atom and three hydrogen atoms (C-H) and central carbon atom with one fluorine atom (C-F). Therefore, they have been four bond pairs.

Now, we have more six valence electrons to distribute within outer H and F bonded atoms. The three hydrogen atoms cannot take more electrons as the valency of hydrogen atom get fulfilled already with bond pair electrons. As the hydrogen atom cannot take more than two electrons. Thus, all the six remaining valence electrons go to fluorine atom only.

Hence the fluorine atom now has total six electrons i.e. one bond pair and three non- bonding electrons. Now, the central carbon atom already had eight electrons which all are bond pair electrons and the outer bonding fluorine atom also has eight electrons one bond pair and six non- bonding electrons.

Also all the three hydrogen atoms have maximum two electrons as per its capacity which are bond pairs. Hence, the central carbon atom and outer bonding fluorine atom has complete octet with presence of eight electrons on it.

Carbon and fluorine atoms of CH3F lewis structure has complete octet

CH3F lewis structure lone pairs

The CH3F lewis structure has fourteen total valence electrons present in it, from them eight electrons already engaged in bonding with three hydrogen and one fluorine atoms and being bond pair electrons. Thus, 14 (VE) – 8 (BE) = 6 (VE), six valence electron get remain for further distribution in outer bonding atoms.

Hydrogen cannot possess more than two electrons as its valency already gets fulfilled. So, all the six electrons will occupy place on fluorine atom. Thus, the fluorine atom has six non- bonding electrons present on it which are being the three lone pair electrons. Thus the CH3F lewis structure has total three lone pair electron present on it.

CH3F lewis structure formal charge

Formal charge is the charge present on the atoms of any molecule, the charge is either positive or negative or zero. The formal charge calculation of any lewis structure or molecule is done with the help of a following formula:

Formal charge = (valence electrons – non-bonding electrons – ½ bonding electrons)

The formal charge on CH3F lewis structure is calculated with the calculating the formal charge of each atom present in the molecule. Means we have to calculate the formal charge of carbon,, hydrogen and fluorine atoms present in CH3F lewis structure.

Carbon atom: Carbon atom has Valence electrons = 04

                       Carbon atom has Non- bonding electrons = 00

                       Carbon atom has Bonding electrons = 08 (2 electrons per single bond)

Formal charge present on Carbon atom is = (04 – 00 – 08/2) = 0

Thus the carbon atom of CH3F lewis structure has zero formal charge.

Hydrogen atom: Hydrogen atom has Valence electrons = 01

                          Hydrogen atom has Non- bonding electrons = 00

                             Hydrogen atom has Bonding electrons = 2 (2 electrons per single bond)

Formal charge present on Hydrogen atom is = (01 – 00 – 2/2) = 0

Thus the hydrogen atom of CH3F lewis structure has zero formal charge.

Fluorine atom: Fluorine atom has Valence electrons = 07

                         Fluorine atom has Non- bonding electrons = 06

                            Fluorine atom has Bonding electrons = 02 (2 electrons per single bond)

Formal charge present on Fluorine atom is = (7 – 6 – 2/2) = 0

Thus the fluorine atom of CH3F lewis structure has zero formal charge.

Hence, the entire C, F and H atoms of CH3F lewis structure has zero formal charge available on it.

Zero formal charge present on CH3F lewis structure

CH3F lewis structure resonance

There are some rules to predict resonance structures of any molecule. I the chemical compound or molecule, there should be at least some multiple bonds are present in the structure may be double or triple bond should be there. Also there is at least one lone pair electron is present in the molecule.

Also there should be some formal charge present on the molecule.If all this situation get fulfil is there in any chemical compound then we can write the resonance structure of that chemical compound.In CH3F there are no multiple bonds and no formal charge is present on it.

There are only six lone pair electrons are present on fluorine atom of CH3F lewis structure. Also all the C-H and C-F bonding between central carbon, hydrogen and fluorine atoms are only single covalent bonds. So, the resonance structure of CH3F lewis structure is not possible.

CH3F lewis structure shape

In CH3F lewis structure, the centrally situated carbon atom is surrounded or joined with four outer bonding elements. Thus with accord to VSEPR theory the molecule in which the central element gets attached with outer four bonding elements with no lone pair electron on central atom comes under AX4 generic formula of VSEPR theory which has tetrahedral shape and geometry.

Thus, in CH3F lewis structure there is no lone electron pair is present on central carbon atom and it gets joined with more four bonding atoms like three hydrogen atoms and one fluorine atom. Hence, it follows AX4 generic formula of VSEPR theory where A is central atom and X is bonding atoms. So, CH3F molecule has tetrahedral molecular geometry and shape as per the VSEPR theory.

CH3F hybridization

The CH3F lewis structure has comes under AX4 generic formula of VSEPR theory in which A = central atom and X = outer bonding atoms to central atom. Thus it has tetrahedral geometry and tetrahedral shape as the central carbon atom of CH3F molecule does not have lone pair of electrons and it is bonded with four outer bonding elements.

Hence, the CH3F lewis structure has tetrahedral shape and geometry as per the VSEPR module, so it has the sp3 hybridization. Thus, the CH3F lewis structure has sp3 hybridization in accordance with VSEPR theory for hybridization.

CH3F lewis structure angle

The CH3F lewis structure, the central carbon atom gets attached with four outer atoms three H and one F atoms and thus it has tetrahedral molecular geometry and shape. Also it has sp3 hybridization as per the VSEPR theory determinations. So, the internal bond angle within CH3F molecule is 109.5 degree.

The hydrogen carbon hydrogen (H-C-H) and hydrogen carbon fluorine (H-C-F) bond angles within CH3F molecule is 109.5 degree. Thus, the overall bond angle between the C, H and F atoms of CH3F lewis structure is 109.5 degree.

CH3F solubility

Fluoromethane (CH3F) is a gaseous compound or molecule and only solubility is seen in water as per previous literature reviews.

Is CH3F ionic?

No, CH3F molecule is not an ionic compound rather it is an covalent molecule.

Why cH3F is not ionic?

All the bonding between carbon, hydrogen and fluorine atoms of CH3F molecule is a single covalent bond which is as a form of strong bond and cannot form ions. Thus CH3F is not an ionic in nature.

How CH3F is not ionic?

The central carbon atom of CH3F molecule is attached with three hydrogen atoms and one fluorine atom with single covalent bond. This covalent bonding is quite much strong to break the bond and form the ions in the CH3F molecule. Thus it is not ionic.

Is CH3F acidic or basic?

Yes, CH3F molecule is acidic in nature.

Why CH3F is acidic?

The strength of any chemical compound to donate its proton or H+ ions to other chemical compounds or the basic compounds is the acidic compounds. CH3F molecule has the capacity to donate its H+ ions or protons to other chemical compounds or basic solutions, thus it is acidic in nature.

How CH3F is acidic?

CH3F (fluoromethane) has three hydrogen atom and one fluorine atom, so there are maximum protons at least three protons or H+ ions are available to donate in CH3F molecule. Hence, CH3F molecule can easily donates its three hydrogen atoms or protons and being an acidic compound.

Is CH3F polar or nonpolar?

Yes, CH3F molecule shows a polar nature.

Why CH3F is polar?

In CH3F molecule there is a fluorine atom present which is most electronegative in nature, hence there is some partial negative charge is creates on fluorine atom and partial positive charge occurs on other bonded atoms, thus there is dipole moment creates which is not zero, therefore CH3F is a polar molecule.

How CH3F is polar?

CH3F molecule has tetrahedral geometry, thus all the atoms in CH3F molecule is arranged in asymmetrical manner also there is no lone electron pair present on central C atom. Due to asymmetric shape of CH3F molecule the charge distribution is no similar within C, H and F atoms. Hence it is polar in nature.

Is CH3F tetrahedral?

Yes, CH3F is tetrahedral molecule.

Why CH3F is tetrahedral?

CH3F molecule follows AX4 generic formula of VSEPR theory according to which it has tetrahedral geometry.

How CH3F is tetrahedral?

Central C atom of CH3F molecule is attached with four atoms i.e. 3 H and 1 F atoms with no lone pair electron and comes under VSEPR theory’s AX4 generic formula. Thus it is a tetrahedral molecule.

Is CH3F linear?

No, CH3F is not linear molecule.

Why CH3F is not linear?

CH3F molecule has tetrahedral molecular geometry thus it is not linear.

How CH3F is not linear?

As per the VSEPR theory CH3F has AX4 generic formula so it is tetrahedral and not linear.

Conclusion:

CH3F lewis structure has total 14 valence electrons and three lone pair electrons. C and F atoms of CH3F molecule has complete octet with no formal charge present on any atoms. It has tetrahedral geometry and shape, it has sp3 hybridization and 109.5 degree bond angle. It is covalent molecule, acidic and polar in nature.

Dr. Shruti Ramteke

Hello everyone I am Dr. Shruti M Ramteke, i did my Ph.D in chemistry. I have five years of teaching experience for 11-12 standard, B,Sc and MSc in chemistry subject. I have published total five research articles during Ph.D on my research work and i have fellowship from UGC for my Ph.D. My Masters with specilization Inorganic chemistry and my graduation with chemistry, zoology and environmental science subjects. thank You

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