Основные свойства ослабевают в ряду веществ

  1. Al2O3 → MgO → Na2O
  2. Li2O → K2O → Rb2O
  3. CaO → MgO → BeO
  4. B2O3 → BeO → Li2O

📝 Detailed explanation

CaO → MgO → BeO — при подъёме вверх по группе основные свойства ослабевают.
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