Which of the following ionic compounds has the highest melting point? A) KBr B) MgO C) RbI D) CaBr₂ E) CsCl

Question

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MgO is a compound between a metal (Mg) and a non-metal (O) and has a high ionic character. The high charge density and the small size of both the Mg²⁺ and O²⁻ ions result in strong electrostatic attractions between the ions in the crystal lattice, making it difficult to break the lattice and melt the compound. Thus, MgO has the highest melting point among the given compounds.

Which of the Following Ionic Compounds Has the Highest Melting