Question

Which of the following elements should have maximum first ionization enthalpy (a) Mg (b) Al (c) P (d) S​

Answer 1

Answer:

Phosphorus(P)

Explanation:

ionization enthalpy increases from left to right.. so sulphur should have more I.E. but it is an exception so P has more I.E than S

because in phosphorus, it has fully filled 'p' orbital. Generally, fully filled orbitals are more stable.Hence,we need more energy to remove an electron.Thus, phosphorus is having more ionisation energy than sulphur