Most acidic oxide is

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

In a periodic table, how does the basic character of oxides vary?

Red hot carbon will remove oxygen from the oxides $XO$ and $YO$ but not from $ZO$. $Y$ will remove oxygen from $XO$. Use this evidence to deduce the order of activity of the three metals $X, Y$ and $Z$ putting the most active first.

An atom with atomic number $20$ is most likely to combine chemically with the atom whose atomic number is

Which of the following pairs has elements containing the same number of electrons in the outermost orbit?