Which of these has no unit?

If coordinate $X$ is atomic number,then select the best option for the $Y$ coordinate based on the given graph for $Li$,$Na$,and $K$.

Which of the following is the correct order of electronegativity?

Which of the following properties displays a progressive increase with the rise in atomic number across a period in the periodic table?

Which of the following electronic configurations will have nearly zero electronegativity?

Given below are two statements :
Statement $I$ : The electronegativity of group $14$ elements from $Si$ to $Pb$ gradually decreases.
Statement $II$ : Group $14$ contains non-metallic,metallic,as well as metalloid elements.
In the light of the above statements,choose the most appropriate from the options given below :