The molecular formulas of diatomic bromine, chlorine, fluorine, and iodine are written below. Circle the formula of the molecule that has the longest bond length. Justify your choice in terms of the atomic structure.
1) Br2
2) Cl2
3) F2
4) I2
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Answer:
Br2
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The formula of the molecule that has the longest bond length is : (4) I₂.
- The bond lengths of the given diatomic halogens are:
F -F = 142 pm,
Cl-Cl = 199 pm,
Br-Br = 228 pm,
I-I = 266 pm
- Due to the presence of more no of electrons, there is more repulsion and the bond is weak.
- Hence, I₂ has the longest bond length.
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