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The bond order of a molecule is given by:
A. the difference between the number of electrons in bonding and antibonding orbitals
B. total number of electrons in bonding and antibonding orbitals
C. twice the difference between the number of electrons in bonding and antibonding orbitals
D. half the difference number of electrons in bonding and antibonding orbitals


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Last updated date: 20th Jun 2024
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Answer
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Hint: Bond order is introduced by Linus Pauling . The bond number itself is that the number of electron pairs (bonds) between a pair of atoms. Bond number gives a sign of the steadiness of a bond. Isoelectronic species have the same bond number.

Complete step by step answer:
If there are greater than two atoms within the molecule, follow these steps to see the bond order: -Draw the Lewis structure
-Count the entire number of bonds.
-Count the amount of bond groups between individual atoms.
-Divide the amount of bonds between atoms by the overall number of bond groups within the molecule. Bond order is defined as half the difference between the amount of electrons in bonding molecular orbital (Nb) and therefore the number of electrons within the antibonding molecular orbitals (${{N}_{a}}$). The bond order describes the steadiness of the bond. The molecular orbital provides a simple understanding of the concept of the bond order of an attraction. It gives us an approximate quantity of the degree of covalent bonds between the atoms. i.e., Bond order =$\dfrac{1}{2}({{N}_{b}}-{{N}_{a}})$
Here ${{N}_{b}}$ is the no of bonding electrons and ${{N}_{a}}$ is the no of antibonding electrons. Number of bonds during a molecule is additionally referred to as bond order.
So, we can conclude that bond order is half the difference number of electrons in bonding and antibonding orbitals.

So, we obtain our answer as option D.

Note: The length of the bond is decided by the quantity of bonded electrons (the bond order). The upper the bond order, the stronger the pull between the 2 atoms and also the shorter the bond length. The sum of the covalent radii between the two atoms gives us the approximate length of the bond.