Question

Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which of these have Physical and Chemical properties resembling chlorine?

Answer 1

Fluorine and chlorine have atomic numbers 9 and 35, respectively as both are halogens. They belong to the same group 17 and have seven electrons in their valence shell. The valency is 1. Both elements are non-metallic.