Question

The atomic number of A is 17. Name the element A and state whether A is a metal or non- metal.

Answer 1

The element has an atomic number of 17 therefore it must be present in group 17 of the periodic table. Group 17 lies on right hand side of the periodic table which shows that A is a non-metal (non-metals are placed on the right hand side of the periodic table). This element is chlorine. The elements of group 17 are also called halogens.