Why Is Calcium Fluoride,Ca $\mathrm { F } _ { 2 }$

question 11

Multiple Choice

Why is calcium fluoride,Ca $\mathrm { F } _ { 2 }$ ,a high melting point crystalline solid while stannic chloride, $\mathrm { SnCl } _ { 4 }$ ,is a volatile liquid?

• A)There is no theory to predict the physical property of melting point.Melting point temperatures are empirically determined.
• B)Actually,we would predict these results to be the opposite.Since each metal is combined with a group 17 halogen,the heavier metal (tin)combination should have the higher melting point.
• C)Ca \(\mathrm { F } _ { 2 }\) is a small,linear,non-polar molecule,while \(\mathrm { SnCl } _ { 4 }\) is a huge tetrahedral structure.Therefore the bonds in calcium fluoride tend to give it a higher melting point temperature.
• D)Ionic compounds formed by elements on opposite sides of the periodic table,like \(\mathrm { CaF } _ { 2 }\) ,tend to have higher melting points than more covalently bonded structures,like \(\mathrm { SnCl } _ { 4 }\)

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