Question

An element M has an atomic number 9 and atomic mass 17. Its ion will be represented by -

• A. M
• B. $M^{+2}$
• C. $M^{-}$
• D. $M^{-2}$

Answer 1

Answer: (C)

The element is halogen and has one less electron than inert gas configuration, hence can be represented as $M^{-}$ ion.