Question

the diagrams below show the structures of two ionic solids, sro and the unknown metal oxide mo. based on the diagrams above and periodic trends, which of the following correctly identifies the metal cation m²⁺? choose 1 answer. a mg²⁺ b ti²⁺ c fe²⁺ d ba²⁺

Explanation:

Step1: Consider ionic - radius trends

Ionic radius increases down a group in the periodic table. In ionic compounds with the same anion (here \(O^{2 -}\)), a larger - sized cation will result in a larger - sized ionic solid structure.

Step2: Compare the sizes of given cations

Among \(Mg^{2+}\), \(Ti^{2+}\), \(Fe^{2+}\), and \(Ba^{2+}\), \(Ba^{2+}\) is the largest as it is in the lowest position in the periodic table among these cations. Since the structure of \(MO\) is similar to \(SrO\) and we know that \(Sr\) is a large - sized cation, and \(Ba\) is even larger than \(Sr\) in the same group (Group 2).

Answer:

D. \(Ba^{2+}\)