Question

The radius of $A^{+}$ is $0.98\mathring{A}$ and $B^{-}$ is $1.81\mathring{A}$. The a\coordination number of $A^{+}$ is

• A. $4$
• B. $6$
• C. $8$
• D. $2$

Answer 1

The correct option is B $6$

Radius ratio of ions =

This radius ratio lies between 0.441-0.732 which gives us the octahedral structure and coordination number 6.