Chemical BondingMedium
Question
The covalent radii of atoms A and B are $r_{A}$ and $r_{B}$, respectively. The covalent bond length and total length of AB molecule are respectively :
Options
A.$\left( r_{A} + r_{B} \right),2\left( r_{A} + r_{B} \right)$
B.$\frac{1}{2}\left( r_{A} + r_{B} \right),\left( r_{A} + r_{B} \right)$
C.$\left( r_{A} + r_{B} \right),\left( r_{A} + r_{B} \right)$
D.$2\left( r_{A} + r_{B} \right),\frac{1}{2}\left( r_{A} + r_{B} \right)$
Solution
Sol. [Key Concept: By NCERT convention the covalent bond length $= r_{A} + r_{B}$ while the total molecular length $= 2(r_{A} + r_{B})$.]
According to NCERT
Bond length $= r_{A} + r_{B}$
Total length of molecule $= 2\left( r_{A} + r_{B} \right)$
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