Question

Arrange the following in order of decreasing bond energy

Part A 

Arrange the following in order of decreasing bond energy. A blank molecular orbital diagram (Figure 1) has been provided to help you. 

Rank the fluorine species from highest to lowest bond energy. To rank items as equilvalent, overlap them. 

Answer 1

ET, FL and Decreasing order of bond energy : Ft > Fz > Highest bond energy > Ft Lowest bond energy =) Bond energy means bond strength. Higher bond energy means higher bond strength. Bond energy is inversly proportional to bond length. Larger bond length means smaller bond energy. Smaller bond length means larger bond energy. In Fat we know that the cation has smaller size than netral atom due to effective nuclear charge increases.

As the effective nuclear charge increases, size decreases. Bond length in Ft will be smelles than Fz So, Bond energy of Fzt is more than fq. In Fr, we know anion has larger size than neutral atom due to decrease in effective nuclear charge. As the effective nuclear charge decreases, size increases Bond length in £ will be larger than F2 . So, Bond energy of F is less than F2. Hence, F has highest bond energy and Ę has lowest bond energy.