The element with $ns^2np^2$ valence shell configuration belongs to which group?

The oxide of a metal $(R)$ can be reduced by the metal $(P)$,and metal $(R)$ can reduce the oxide of metal $(Q)$. Then the decreasing order of the reactivity of metals $(P)$,$(Q)$,and $(R)$ with oxygen is:

Select the correct order.

On moving from left to right across a period in the periodic table,the metallic character:

Which pair of elements has the same chemical properties?

Which of the following represents the correct order of acidic strength of the given oxides?