Which of the following is the most electropositive element?

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

Which one of the following is the most electropositive element?

Of the following acids,the one that is strongest is

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

$Fe$ is placed in the eighth group of the periodic table. What is the number of electrons in its outermost orbit?