Across a period: smaller atoms, higher ionisation energy. ⚛️ Down a group: bigger atoms, lower ionisation energy. Periodic trends = nuclear charge shielding. Electronegativity ↑ across, ↓ down. #chemistry #lcchemistry #leavingcert
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Group 1 metals reacting with water. Students can describe it in class: Lithium → gentle fizz Sodium → melts into a ball Potassium → lilac flame They know it gets more vigorous down the group. But in the exam? “Explain why potassium reacts more vigorously than sodium.” Suddenly… hesitation. Is it shielding? Is it atomic radius? Is it outer electrons? Self-doubt creeps in — and marks disappear. This is why I push structured thinking and memory anchors so hard. If you don’t have a clear framework i
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4.17: Electron Shielding
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