The correct order of the non-metallic character among the elements $B, C, N, F$ and $Si$ is

What are the major differences between metals and non-metals?

$HClO_4$ is a stronger acid than $H_2SO_4$ due to which of the following reasons?
$1$. Oxidation state of $Cl$ in $HClO_4$ is $+7$ and that of $S$ in $H_2SO_4$ is $+6$.
$2$. $Cl$ is more electronegative than $S$.
$3$. $HClO_4$ is monobasic,whereas $H_2SO_4$ is dibasic.
$4$. $ClO_3$ part of $HClO_4$ can break $O-H$ bond more easily to liberate a proton than $SO_3$ part in $H_2SO_4$.

All the elements in a group in the periodic table have the same

Which of the following diagrams correctly represents the trend in the acidic strength of the given oxides?

The type of oxide formed by the element among $Li$,$Na$,$Be$,$Mg$,$B$,and $Al$ that has the least atomic radius is $:$