Chemistry, asked by kulwantkaur5607, 1 year ago

Why melting point of MgO is much higher than that of BaO

Answers

Answered by ArnabDas
8


Because of difference in the lattice energy!

They all have the same FCC lattice structure, but the lattice energy of MgO is roughly 4 time of that NaCl and KCl because it is proportional to Z+•Z-.

Furthermore, Mg2+ and O2- both have a electron configuration of Ne, while Ba2+ has a Xe’s one. So the distance between Ba2+ and O2- is larger than that between Mg2+ and O2-. Since lattice energy is disproportional to this distance, that could be why the lattice energy of MgO is larger than that of BaO.

Lattice energy higher, melting point point higher!


ArnabDas: please mark as Brainlist!
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