The electron affinity for the inert gases is

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why?

The electron affinity values are negative for:
$A$. $Be \rightarrow Be^{-}$
$B$. $N \rightarrow N^{-}$
$C$. $O^{-} \rightarrow O^{2-}$
$D$. $Na \rightarrow Na^{-}$
$E$. $Al \rightarrow Al^{-}$
Choose the most appropriate answer from the options given below:

Explain the trends in electron gain enthalpy across periods and down groups.

The energy evolved is highest for which of the following reactions?

Which of the following elements have the highest and lowest electron gain enthalpy,respectively?