NSF Lewis Structure & Characteristics: 15 Complete Facts

NSF, also called thiazyl fluoride, is a colourless gas with a pungent smell. Its molar mass is 65.07 g/mol. Let us describe various facts of NSF Lewis structure.
NSF Lewis structure contains Sulphur, nitrogen and fluorine atoms. Due to the more electronegativity of the nitrogen atom, it is placed in the middle. While Sulphur and fluorine are present in the surrounding.
In NSF all nonmetals are combined from thiazyl fluoride. Out of them, nitrogen has one lone pair, sulphur has two and fluorine has three lone pairs. Let us discuss lone pair, bond angle, hybridization and some more characteristics of NSF Lewis structure.

How to draw NSF Lewis structure?

Lewis structure is the simple representation of any molecule which tells us about the presence of valence electrons and bonding in a molecule. Let us look at the steps below.

Presence of Valence electrons:

NSF contain a total of 18 valence electrons. Out of them, nitrogen is placed in the 15 th group, Sulphur is placed in the 16th group, and fluorine is placed in the 17 th group of the periodic table. Hence, they have 5,6 and 7 valence electrons respectively.

Determine the central atom:

The atom which has less electronegativity is placed in the center of the Lewis structure. In the NSF Lewis structure, nitrogen has less electronegativity hence it is placed in the center. While Sulphur and fluorine are present in the surrounding.

Valence electrons and lone pairs on atoms:

In NSF Lewis structure the outermost atom of sulphur and fluorine requires 8 electrons to complete its octet. Hence 16 valence electrons are distributed on both the atoms. The remaining two lone pair electrons are placed on the nitrogen atom.

Find out the stability of Lewis structure:

The formal charge of NSF Lewis structure tells us about the stability of that molecule. If the formal charge of all the atoms will be zero, it has a stable Lewis structure.

NSF lewis structure
Lewis structure of NSF

NSF Lewis structure resonance

Resonance structures are formed by the interaction of lone pairs of electron and pi bonds. Let us discuss resonance in NSF.
NSF Lewis structure shows resonance. Because it contains a double bond and lone pair for delocalization. Sulphur has a double bond with nitrogen this double bond is shifted toward the fluorine and one more lone pair is added to the sulphur atom.
In the resonating structure double bond is present between nitrogen and a fluorine atom. And lone pair of fluorine is shifted on the sulphur atom.

Resonating structure of NSF

NSF Lewis structure shape

The shape of the Lewis structure is determined by the arrangement of atoms present in the molecule. Let us find out the shape of NSF.
NSF Lewis structure shows bent shape geometry. The central nitrogen atom is bonded with sulphur and fluorine atoms. Also, all the atoms have lone pairs of electrons.

nsf lewis structure
Bent shape of NSF Lewis structure

NSF Lewis structure formal charge

Lewis structure formal charges tell us about the stability of molecules. Let us discuss the formal charges of NSF Lewis structure.

NSF Lewis structure formal charge is zero which is calculated by the following formula. The formal charge in the NSF molecule is = No. of valence electrons (V) – No. of non–bonding electrons (N) – No. of bonding electrons B/2.

  • Formal charge of N in NSF molecule = 5- 2 – 6/2 = 0
  • Formal charges of S in NSF molecule = 6 – 4 – 4/2 = 0
  • Formal charges of F in NSF molecule = 7- 6 – 2/2 = 0
  • Therefore, in the NSF molecule Nitrogen, sulphur and fluorine atom have zero
    formal charges.

NSF Lewis structure angle

Lewis structure angle is the angle made by the atoms present in the molecule that forms a covalent bond. Let us figure out the angle form by NSF molecule.
NSF Lewis structure shows 120° bond angles due to AX2E type molecule. Therefore, it shows trigonal planar geometry with a bent shape. NSF molecule also has lone pairs on the atoms.
Due to the presence of lone pair, there is repulsion by the lone pair which decreases the bond
by about 116.92°.

NSF Lewis structure octet rule

According to octet rule all atoms has 8 electrons in its outermost orbital to attain the nearest noble gas configuration. Let us see whether NSF follows the octet rule.
NSF Lewis structure follows the octet rule. All three atoms of nitrogen-oxygen and sulphur have eight electrons by forming bonds with each other and lone pairs. Thus, all the atoms S, F and N in NSF show electrons with a complete octet.
In NSF Lewis structure nitrogen atom has 6 bonding electrons and 2 non-bonding electrons. Also, sulphur has four non-bonding and 4 bonding electrons. while fluorine has 6 non- bonding and 2 bonding electrons. In that way, they complete their octet.

NSF Lewis structure lone pairs

The Lewis structure of lone pairs does not involve bond formation. Which is denoted by a dot. Let us find lone pair of NSF.
NSF Lewis structure has six lone pairs. It has a total of 18 valence electrons out of them 6 electrons are involved in bond formation. While the remaining 12 electrons form lone pairs on the NSF molecule.

NSF valence electrons

Valence electrons are present in the outermost orbital of the molecule. Which are very reactive and hence form bonds. Let us look out for the valence electrons of NSF.

NSF has 18 valence electrons. Out of them, nitrogen has three bond pairs and one lone pair. Then sulphur has 4 bond pairs and 4 lone pairs while fluorine has 2 bond pairs and 6 lone pairs.
All are bond pairs and lone pairs of the nitrogen, sulphur and fluorine atom combine to form
a total of 18 valence electrons.

NSF hybridization

Hybridization is the process in which the mixing and overlapping of atomic orbital take
place. Let us discuss the hybridization of NSF.
NSF shows sp2 hybridization. The steric number of a central nitrogen atom is 3. Which is calculated by the no. of bonded atom and no. of lone pairs. N= 2 bonded atoms + 1 lone pair = 3.
Due to 3 steric numbers according to VSEPR theory, it shows sp2 hybridization. NSF has1s
& 2p orbital combined to form sp2 hybrid orbital.

Is NSF soluble in water?

Any ionic or polar molecule is soluble in water by ionization via hydrogen bonding with the water molecule. Let us see whether NSF is soluble in water or not.
NSF does not soluble in water. As it cannot dissociates into positive and negative ions. NSF molecule does not contain hydrogen bonding. It does not have dipole-dipole interaction So, NSF is not able to soluble in water.

Is NSF polar or nonpolar?

A molecule is polar when it has a net or zero dipole moment with asymmetrical atoms arrangement & uniform electron distribution. Let us find out NSF is polar or non-polar.
NSF is polar in nature. It has zero dipole moment with an asymmetrical arrangement of nitrogen, sulphur and fluorine atoms.

Why and How NSF is polar?

NSF is polar because it has a more electronegative nitrogen atom, creating electron clouds around itself. Also, it has asymmetrical bent shape geometry due to which it has some net dipole moment with unequal sharing of electrons.

Is NSF a molecular compound?

Molecular compounds are also called covalent compounds which form a covalent bond by sharing electrons with each other. Let us discuss whether NSF is molecular or ionic.

NSF is a molecular compound. Because it forms a covalent bond by unequal sharing between the sulphur–nitrogen and nitrogen-fluorine atom. It cannot dissociate into positive and negative ions.

Is NSF an acid or base?

According to Lewis concept the acidic molecule are electron accepters and basic molecules are electron doners. Let us discuss the nature of NSF molecule.

NSF molecule neighter acid nor base. It is a neutral molecule because it is a gaseous molecule also has double bond which requires more energy to break this bond. Also, NSF has lone pair which are neighter electron accepter nor doner.

Is NSF an electrolyte?

Electrolytes are substances that dissolved in solution and dissociate into ions. These ions that carry electricity. Let us determine whether NSF is an electrolyte.
NSF is not an electrolyte because it does not dissociate into ions when dissolve in solution. It cannot conduct electricity.

Is NSF a salt?

Any salt is a chemical substance which contains both anions and cations. Let us find out whether NSF is salt or not.
NSF does not act as salt. Because it is a colourless gas which is not dissociated into cation and anion. It is a molecular compound, not an ionic compound.

Is NSF ionic or covalent?

Ionic compound ionizes into cation and anion while covalent compound for the covalent bond between the atoms presents in the molecule. Let us see if NSF is ionic or covalent.
NSF is covalent in nature because it forms a covalent bond between the atoms by sharing electrons with each other. It does not ionize into ions.


NSF is a colourless gas. It has 18 valence electrons and 6 lone pairs with a bent shape geometry. NSF shows sp2 hybridization with a bond angle of 117o. Also, we had discussed the other characteristics of NSF Lewis structure.

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Darshana Fendarkar

Hi....I am Darshana Fendarkar, I have completed my Ph.D. from the University of Nagpur. My area of specialization is Inorganic Chemistry. I have an experience as a Chemist at Earthcare Pvt. Ltd. Also I have 2 years of experience in teaching. Currently, I am working with Lambdageek as a Subject Matter Expert. Let's connect through LinkedIn-https://www.linkedin.com/in/dr-darshana-fendarkar-00380540

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