The cause of the diagonal relationship is:

Which of the following orders is incorrect?

In what properties do the first elements of a group differ from the subsequent elements of the same group?

Given below are two statements:
Statement-$I$: $C < O < N < F$ is the correct order in terms of first ionization enthalpy values.
Statement-$II$: $S > Se > Te > Po > O$ is the correct order in terms of the magnitude of electron gain enthalpy values.
In the light of the above statements,choose the correct answer from the options given below:

Given below are two statements :
Statement $I$ : $K > Mg > Al > B$ is the correct order in terms of metallic character.
Statement $II$ : Atomic radius is always greater than the ionic radius for any element.
In the light of the above statements,choose the correct answer from the options given below

Which of the following pairs shows a diagonal relationship?