The positions of three elements A, B and C in the periodic table are shown below:
`{:("Group 16","Group 17"),(-,-),(-,A),(-,-),(B,C):}`
Which type of ion, cation or anion will be formed by the element A?

Explanation

The element A, as pointed out earlier is a non-metal which belongs to group 17. It has seven valence electrons (2,8,7).In order to have the configuration of the nearest noble gas element, it will take up one electron and change to anion i.e., `A^(-)` ion.