![]() ![]() 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 OCN molecule. ![]() Step 6: Check the stability of lewis structure Now let’s proceed to the final step to check whether the lewis structure of OCN is stable or not. You can see from the above picture that the carbon atom is forming an octet. (Because nitrogen is less electronegative than oxygen.)Īfter shifting this electron pair, the central carbon atom will get 2 more electrons and thus its total electrons will become 8. ![]() So again we have to shift one more electron pair from the nitrogen atom only. So you have to shift the electron pair from the nitrogen atom.)īut after shifting one electron pair, the carbon atom is still not forming an octet as it has only 6 electrons. Here if we compare the nitrogen atom and oxygen atom, then the nitrogen atom is less electronegative. This is because the less electronegative atom has more tendency to donate the electron. (Note: Remember that you have to shift the electron pair from the atom which is less electronegative. Now to make this carbon atom stable, you have to shift the electron pair from the outer nitrogen atom so that the carbon atom can have 8 electrons (i.e octet). Carbon has only 4 electrons and it is unstable. Unfortunately, the carbon atom is not forming an octet here. In order to check the stability of the central carbon (C) atom, we have to check whether it is forming an octet or not. In this step, you have to check whether the central carbon atom (C) is stable or not. If it does not have octet, then shift the lone pair to form a double bond or triple bond. Step 5: Check the octet on the central atom. Total valence electrons in OCN- ion = valence electrons given by 1 oxygen atom + valence electrons given by 1 carbon atom + valence electrons given by 1 nitrogen atom + 1 more electron is added due to 1 negative charge = 6 + 4 + 5 + 1 = 16. You can see the 5 valence electrons present in the nitrogen atom as shown in the above image. Hence the valence electrons present in nitrogen is 5. Nitrogen is a group 15 element on the periodic table. → Valence electrons given by nitrogen atom: You can see the 4 valence electrons present in the carbon atom as shown in the above image. Hence the valence electrons present in carbon is 4. → Valence electrons given by carbon atom:Ĭarbon is group 14 element on the periodic table. ![]() You can see the 6 valence electrons present in the oxygen atom as shown in the above image. Hence the valence electrons present in oxygen is 6. Oxygen is group 16 element on the periodic table. → Valence electrons given by oxygen atom: Here, I’ll tell you how you can easily find the valence electrons of oxygen, carbon as well as nitrogen 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 OCN- (cyanate ion) ion, first of all you should know the valence electrons present in oxygen atom, carbon atom as well as nitrogen atom. Steps of drawing OCN- lewis structure Step 1: Find the total valence electrons in OCN- ion ![]()
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