Consider the elements $N$,$P$,$O$,$S$,$Cl$ and $F$. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

Which of the following oxides is different from the other three oxides?

In which case,the order of acidic strength is not correct?

Given below are two statements:
Statement $I$: The number of pairs among $[Al_2O_3, Cr_2O_3]$,$[Cl_2O_7, Mn_2O_7]$,$[Na_2O, V_2O_3]$ and $[CO, N_2O]$ that contain oxides of same nature (acidic,basic,neutral or amphoteric) is $4$.
Statement $II$: Among $Na_2O, Al_2O_3, CO$ and $Cl_2O_7$,the most basic and acidic oxides are $Na_2O$ and $Cl_2O_7$,respectively.

The correct order of the metallic character of the elements $Be, Al, Na, K$ is

Which pair of elements has the same chemical properties?