For each of the following pairs, predict which one has lower first ionisation enthalpy.
N or O.

Which has higher ionisation enthalpy and why, Mg or Al.

Which one of the following pairs is mismatched?

Which one of the following pairs is mismatched?

Which of the following pairs has the same size ?

Which one of the following is correctly paired?

Which one of the following pairs is correctly matched?

Which of the following has highest ionisation enthalpy? P , N , As , Sb .

Which of the following pairs of elements would have a more negative electron gain enthalpy? i) O or N ii) F or Cl