Among , the order of ionic character is

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🧠 The Fajan's Rule Flip
"Ionic" and "Covalent" are not binary; they are a spectrum. For metal hydrides, the ionic character is determined by how well the metal cation can polarize the hydride anion ().

🗺️ The Group 2 Trend
1. Cation Size: As you go down Group 2 (), the size of the cation increases.
2. Polarizing Power: According to Fajan's Rule, smaller cations with high charge densities are "bullies"—they pull the electron cloud of the anion towards themselves, creating covalent character.
3

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