I hope you have completely understood all the above steps.įor more practice and better understanding, you can try other lewis structures listed below.Electron configuration chart of all Elements is mentioned in the table below. By doing so, you will get the following lewis structure of AsF3. In the above lewis dot structure of AsF3, you can also represent each bonding electron pair (:) as a single bond (|). This indicates that the above lewis structure of AsF3 is stable and there is no further change in the above structure of AsF3. You can see the number of bonding electrons and nonbonding electrons for each atom of AsF3 molecule in the image given below.įor Arsenic (As) atom: Valence electrons = 5 (because arsenic is in group 15) Bonding electrons = 6 Nonbonding electrons = 2įor Fluorine (F) atom: Valence electrons = 7 (because fluorine is in group 17) Bonding electrons = 2 Nonbonding electrons = 6 Formal chargeįrom the above calculations of formal charge, you can see that the arsenic (As) atom as well as fluorine (F) atom has a “zero” formal charge. In short, now you have to find the formal charge on arsenic (As) atom as well as fluorine (F) atoms present in the AsF3 molecule.įor calculating the formal charge, you have to use the following formula įormal charge = Valence electrons – (Bonding electrons)/2 – Nonbonding electrons The stability of lewis structure can be checked by using a concept of formal charge. Now you have come to the final step in which you have to check the stability of lewis structure of AsF3. Step 6: Check the stability of lewis structure Now let’s proceed to the final step to check whether the lewis structure of AsF3 is stable or not. That means it has 8 electrons.Īnd hence the central arsenic atom is stable. You can see from the above picture that the arsenic atom is forming an octet. In order to check the stability of the central arsenic (As) atom, we have to check whether it is forming an octet or not. In this step, you have to check whether the central arsenic atom (As) is stable or not. Step 5: Check the octet on the central atom You have to put these 2 electrons on the central arsenic atom in the above sketch of AsF3 molecule. So the number of electrons which are left = 26 – 24 = 2. The AsF3 molecule has a total 26 valence electrons and out of these, only 24 valence electrons are used in the above sketch. These outer fluorine atoms are forming an octet and hence they are stable.Īlso, in step 1 we have calculated the total number of valence electrons present in the AsF3 molecule. Here in the sketch of AsF3 molecule, you can see that the outer atoms are fluorine atoms. Now in this step, you have to check the stability of the outer atoms. Place the remaining valence electrons pair on the central atom. This indicates that the arsenic (As) and fluorine (F) are chemically bonded with each other in a AsF3 molecule. Now in the AsF3 molecule, you have to put the electron pairs between the arsenic atom (As) and fluorine atoms (F). Step 3: Connect each atoms by putting an electron pair between them So here the arsenic atom (As) is the center atom and the fluorine atoms (F) are the outside atoms. If we compare the electronegativity values of arsenic (As) and fluorine (F) then the arsenic atom is less electronegative. You can see the electronegativity values of arsenic atom (As) and fluorine atom (F) in the above periodic table. Now here the given molecule is AsF3 and it contains arsenic atom (As) and fluorine atoms (F). Step 2: Select the central atomįor selecting the center atom, you have to remember that the atom which is less electronegative remains at the center. Total valence electrons in AsF3 molecule = valence electrons given by 1 arsenic atom + valence electrons given by 3 fluorine atoms = 5 + 7(3) = 26. You can see the 7 valence electrons present in the fluorine atom as shown in the above image. Hence the valence electron present in fluorine is 7. → Valence electrons given by fluorine atom:įluorine is group 17 element on the periodic table. You can see the 5 valence electrons present in the arsenic atom as shown in the above image. Hence the valence electrons present in arsenic is 5. → Valence electrons given by arsenic atom:Īrsenic is a group 15 element on the periodic table. Here, I’ll tell you how you can easily find the valence electrons of arsenic as well as fluorine using a periodic table. (Valence electrons are the electrons that are present in the outermost orbit of any atom.) In order to find the total valence electrons in an AsF3 molecule, first of all you should know the valence electrons present in arsenic atom as well as fluorine atom. Steps of drawing AsF3 lewis structure Step 1: Find the total valence electrons in AsF3 molecule
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