Note that the 1s orbitals are not shown.

For example, in diatomic nitrogen, N≡N, the bond order is 3; in acetylene, H−C≡C−H, the carbon-carbon bond order is also 3, and the C−H bond order is 1. Identify the bond order of CN. NO + (number of electrons = 7 + 8 – 1 = 14) 0 –2 (number of electrons = 8 + 8 + 1 = 17) 0 22- (number of electrons = 8 + 8 + 2 = 18) Thus, CN and NO + because of the presence of same number of electrons, have same bond order. = √ 1(1+2) BM = √3 BM = 1.73BM.

Here’s a guide on how to construct MO diagrams, in case you need help.

H2 (Total es = 2), Therefore B.O. Another way to prevent getting this page in the future is to use Privacy Pass. This work is licensed under a Creative Commons Attribution 4.0 International License. A. T. Khan, Head, IIT Patna, Dr. Satish Nimse, Dept. of Chemistry, Osmania University and Editor-in-Chief, WJCE, USA, Prof. G.N.Mukherjee, Sir Rashbehary Ghose Professor of Chemistry, Dept. Das, A. can be evaluated in the following way: F-1(For Set-1) - for the determination of number of unpaired electrons (n) of molecules or ions having total number of electrons (1-3), (3-5), (5-7), (7-10) and (13-16)e-s: In this case, the number of unpaired electrons n = [ I (ND - total e-s) I ].

The author, Arijit Das, would be grateful subsequently to Prof. V. Jagannadam, Dept. Complete the molecular orbital diagram for CN. For homo and hetero nuclear diatomic molecules or ions having (1-20)e-s.

Bond order and length are inversely proportional to each other: when bond order is increased, bond length is decreased. Why does type of overlap given in the following figure not result in the bond formation ? digit next to minimum digit and ‘I I’ indicates mod function. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Bond-order usually predicted from the Molecular Orbital Theory. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. = 8 − 2 2 = 3. Bond order is the number of chemical bonds between a pair of atoms; in diatomic nitrogen (N≡N) for example, the bond order is 3, while in acetylene (H−C≡C−H), the bond order between the two carbon atoms is 3 and the C−H bond order is 1. American Journal of Educational Performance & security by Cloudflare, Please complete the security check to access. Arijit Das. The bond order and the magnetic characteristics of CN- are (1) 3, diamagnetic (2) 2(1/2) paramagnetic (3) 3, paramagnetic (4) 2(1/2), diamagnetic of Chemistry, Indian Institute of Science, Bangalore,Prof. Arijit Das, ‘New Innovative methods for prediction Bond order of mono and Diatomic molecules or ions having total number of (1-20)es in a very short time’, IJAR, 2013, 3(09), 63. Which of the following have identical bond order ? Set-1: Molecules or ions having (1-3)e-s, (3-5)e-s, (5-7)e-s, (7-10)e-s, (13-16)e-s, Set-2: Molecules or ions having (10-13)e-s and (16-19)e-s. Then for different set we have to use three different formulae to calculate the number of unpaired electrons which have been presented in Table 2 and thus magnetic moment (μs in B.M.) difference.


Isostructural species are those which have the same shape and hybridization. Copyright © 2012-2017 Science and Education Publishing Co. Ltd All rights reserved. In this pedagogical survey, I have tried to hub two (02) time economic pedagogies by including seven (07) new formulae in the field of chemical education. before last electron). You may need to download version 2.0 now from the Chrome Web Store. Eg. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Yahoo is part of Verizon Media. It may be expected that these innovative methods would go a long way to help to the students of chemistry at Undergraduate, Senior Undergraduate and Post-Graduate level who would choose the subject as their career.

of Chemistry, Calcutta University, Prof. R. N. Mukherjee, Director, IISER, Kolkata, Prof. P. K. Chattaraj, Convenor, centre for Theoretical studies, Deptt.