1. The problem statement, all variables and given/known data under the same conditions which one of the following atoms will liberate the largest amount of energy when it gains an electron? 1.Na(g) 2.Ar(g) 3.Li(g) 4.N(g) 5.Mg(g) 2. Relevant equations 3. The attempt at a solution I was told the answer's N 'cos it's the most electronegative atom out of the choices given but when we consider the electronic configurations of the above atoms Na & Li seems to attain a stable octet by gaining an electron so it would release alot more energy than N which by gaining an electron becomes 2p4 which is far less stable than 2p3. so I think its between Li & Na and since Li has a smaller covalent radius it would probably attract the electron more and so release more energy,am I right?