In NaF and MgO, cations and anions have same electronic configuration. Which of the following statement is true for them?

The two crystals possess Isomorphism.

The answer is 1. The two crystals possess Isomorphism.

Isomorphism is the property of two or more substances having the same crystal structure. \(NaF\) and \(MgO\) both have a face-centered cubic (fcc) structure, so they do exhibit isomorphism.

The cations and anions in both crystals have the same electronic configuration because they are both isoelectronic. Isoelectronic atoms or molecules have the same number of electrons.

In \(NaF\), the sodium cation \((Na^+)\) has 11 electrons and the fluoride anion \((F^-)\) has 9 electrons. The total number of electrons is 20, which is the same as the number of electrons in the neon atom \((Ne)\).

In \(MgO\), the magnesium cation \((Mg^{2+})\) has 10 electrons and the oxide anion \((O^{2-})\) has 8 electrons. The total number of electrons is 18, which is the same as the number of electrons in the argon atom \((Ar)\).

The isoelectronic property of \(NaF\) and \(MgO\) is due to the fact that they are both composed of a metal and a non-metal. The metal atom donates electrons to the non-metal atom, forming an ionic bond. The number of electrons donated by the metal atom is equal to the number of electrons gained by the non-metal atom.