Question

The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic attraction holding that compound together. Based on ion charges and relative ion sizes, arrange these ionic compounds by their expected melting points. A. CsBr B. SrF2 C. RbF D. SrO

Answer 1

Answer:

SrF2>SrO>RbF>CsBr

Explanation:

Ionic solids have their melting points dependent on:

i) size of the the ion: the smaller the size of the ion, the more closely packed the ionic sphere will be and the greater the melting point.

ii) Charge on the ion, the  higher the charge on the ion the greater the electrostatic attraction between the ions and the greater the melting point.

In the arrangement above, the order of cation sizes are Sr2+<Rb+<Cs+

the order of anion sizes are F-<O2-<Br-

This explains the order of melting points given in the answer.