If the valence shell electronic configuration for an element is $ns^2 np^5$,this element will belong to the group of

What is the correct order comparing the acid strengths of $HF$,$HCl$,$HBr$,and $HI$?

Which of the following oxides is the most acidic?

Metals are

Which of the following elements with the given electronic configurations belong to the same group?
$(i)$ $1s^2 2s^2$
$(ii)$ $1s^2 2s^2 2p^5$
$(iii)$ $1s^2 2s^2 2p^6 3s^2 3p^5$
$(iv)$ $1s^2 2s^2 2p^6 3d^{10} 4s^1$

Identify the correct order of basicity for the following oxides: $Na_2O, MgO, CuO, SiO_2$.