Ionisation energy
Ionisation energy
Formula
X(g) → X⁺(g) + e⁻
Real World
The large jump in ionisation energy between the 2nd and 3rd electrons in magnesium confirms it is in Group 2 — a concept used by chemists at AstraZeneca when modelling ionic compound formation for drug design.
Exam Focus
Identify group number from the position of the large jump in successive ionisation energy data — the jump occurs after all outer-shell electrons are removed.
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