Identify the Lewis acid from the following.

Which of the following occurs when two hydrogen atoms bond with each other to form a $H_2$ molecule?

Which of the following will have the highest bond energy?

What is the formal charge on sulfur in the following Lewis structure?

Which atom can have more than eight valence electrons when it is forming covalent bonds?

The $B-F$ bond dissociation energy in $BF_3$ is $646 \ kJ \ mol^{-1}$,whereas the $C-F$ bond dissociation energy in $CF_4$ is $515 \ kJ \ mol^{-1}$. Which of the following is the correct reason for the $B-F$ bond dissociation energy being higher than the $C-F$ bond dissociation energy?