The second electron affinity of an element is ...

Which of the following statements regarding electron affinity is correct?

The electron gain enthalpy $\Delta_{eg}H$ of $Cl_{(g)}$ is $-349 \ kJ \ mol^{-1}$. If the ground state energy of $Cl_{(g)}$ is $x \ kJ \ mol^{-1}$,the ground state energy (in $kJ \ mol^{-1}$) of $Cl^{-}_{(g)}$ is

Which of the following statements is correct?

To which of the following atoms is the attachment of an electron most difficult?

The absolute value of the electron gain enthalpy of halogens satisfies which of the following orders?